Reduce needed client restarts for settings changes.

src/fe-gtk/chanview.c

@@ -307,6 +307,109 @@ chanview_set_impl (chanview *cv, int type)
 		cv->func_focus (cv->focused);
 }
 
+void
+chanview_set_sorted (chanview *cv, gboolean sorted)
+{
+	cv->sorted = sorted ? 1 : 0;
+}
+
+void
+chanview_set_use_icons (chanview *cv, gboolean use_icons)
+{
+	cv->use_icons = use_icons ? 1 : 0;
+}
+
+void
+chanview_set_trunc_len (chanview *cv, int trunc_len)
+{
+	cv->trunc_len = trunc_len;
+}
+
+typedef struct
+{
+	chan *ch;
+	int old_pos;
+} chanview_sort_entry;
+
+/* re-sort the session rows below one parent with cb_compare, leaving
+ * utility rows (tag != 0) in place; mirrors chanview_insert_sorted() */
+static void
+chanview_resort_children (chanview *cv, GtkTreeIter *parent)
+{
+	GtkTreeModel *model = GTK_TREE_MODEL (cv->store);
+	GtkTreeIter iter;
+	chanview_sort_entry *entries;
+	int *positions;
+	gint *new_order;
+	chan *ch;
+	int n, i, j, count;
+
+	n = gtk_tree_model_iter_n_children (model, parent);
+	if (n < 2)
+		return;
+
+	entries = g_new0 (chanview_sort_entry, n);
+	positions = g_new0 (int, n);
+	new_order = g_new0 (gint, n);
+
+	count = 0;
+	for (i = 0; i < n; i++)
+	{
+		new_order[i] = i;
+		if (!gtk_tree_model_iter_nth_child (model, &iter, parent, i))
+			continue;
+		gtk_tree_model_get (model, &iter, COL_CHAN, &ch, -1);
+		if (ch && ch->tag == 0 && ch->userdata)
+		{
+			entries[count].ch = ch;
+			entries[count].old_pos = i;
+			positions[count] = i;
+			count++;
+		}
+	}
+
+	/* stable insertion sort; tab groups stay small so this is cheap */
+	for (i = 1; i < count; i++)
+	{
+		chanview_sort_entry key = entries[i];
+
+		j = i - 1;
+		while (j >= 0 && cv->cb_compare (entries[j].ch->userdata, key.ch->userdata) > 0)
+		{
+			entries[j + 1] = entries[j];
+			j--;
+		}
+		entries[j + 1] = key;
+	}
+
+	for (i = 0; i < count; i++)
+		new_order[positions[i]] = entries[i].old_pos;
+
+	gtk_tree_store_reorder (cv->store, parent, new_order);
+
+	g_free (entries);
+	g_free (positions);
+	g_free (new_order);
+}
+
+/* top-level rows keep their order (insertion never sorts them either);
+ * only the children within each family are sorted */
+void
+chanview_resort (chanview *cv)
+{
+	GtkTreeIter iter;
+
+	if (!cv->cb_compare)
+		return;
+
+	if (gtk_tree_model_get_iter_first (GTK_TREE_MODEL (cv->store), &iter))
+	{
+		do
+			chanview_resort_children (cv, &iter);
+		while (gtk_tree_model_iter_next (GTK_TREE_MODEL (cv->store), &iter));
+	}
+}
+
 static void
 chanview_free_ch (chanview *cv, GtkTreeIter *iter)
 {

src/fe-gtk/chanview.h

@@ -34,6 +34,10 @@ void chanview_set_callbacks (chanview *cv,
 	gboolean (*cb_contextmenu) (chanview *, chan *, int tag, void *userdata, GdkEventButton *),
 	int (*cb_compare) (void *a, void *b));
 void chanview_set_impl (chanview *cv, int type);
+void chanview_set_sorted (chanview *cv, gboolean sorted);
+void chanview_set_use_icons (chanview *cv, gboolean use_icons);
+void chanview_set_trunc_len (chanview *cv, int trunc_len);
+void chanview_resort (chanview *cv);
 chan *chanview_add (chanview *cv, char *name, void *family, void *userdata, gboolean allow_closure, int tag, GdkPixbuf *icon);
 int chanview_get_size (chanview *cv);
 GtkWidget *chanview_get_box (chanview *cv);

src/fe-gtk/maingui.c

@@ -569,6 +569,18 @@ mg_create_tab_colors (void)
         away_list = mg_attr_list_create (&gui_palette[THEME_TOKEN_TAB_AWAY], FALSE);
 }
 
+static PangoAttrList *
+mg_attr_list_for_tab_state (int state)
+{
+        if (state & TAB_STATE_NEW_HILIGHT)
+                return nickseen_list;
+        if (state & TAB_STATE_NEW_MSG)
+                return newmsg_list;
+        if (state & TAB_STATE_NEW_DATA)
+                return newdata_list;
+        return plain_list;
+}
+
 static void
 set_window_urgency (GtkWidget *win, gboolean set)
 {
@@ -714,7 +726,10 @@ mg_set_access_icon (session_gui *gui, GdkPixbuf *pix, gboolean away)
 {
         if (gui->op_xpm)
         {
-                if (pix == gtk_image_get_pixbuf (GTK_IMAGE (gui->op_xpm))) /* no change? */
+                /* no change? (the pref check makes sure a live settings
+                   change can still remove the icon) */
+                if (pix == gtk_image_get_pixbuf (GTK_IMAGE (gui->op_xpm)) &&
+                         prefs.hex_gui_input_icon)
                 {
                         mg_set_myself_away (gui, away);
                         return;
@@ -3596,6 +3611,48 @@ mg_create_topicbar (session *sess, GtkWidget *box)
 	mg_create_chanmodebuttons (gui, bbox);
 }
 
+/* re-apply the multi-line topic and inline mode button preferences to an
+ * already built topic bar (see mg_create_topicbar () for the layout) */
+
+static void
+mg_update_topicbar_layout (session_gui *gui)
+{
+	GtkWidget *topic = gui->topic_entry;
+	GtkWidget *vbox = gui->topic_bar;
+	GtkWidget *topic_scroll;
+	GtkWidget *hbox;
+	GtkWidget *mode_hbox;
+	GtkWidget *desired_parent;
+	GtkWidget *current_parent;
+	gboolean wrap;
+
+	if (!topic || !GTK_IS_TEXT_VIEW (topic) || !vbox || !gui->topicbutton_box)
+		return;
+
+	wrap = prefs.hex_gui_topicbar_multiline && !prefs.hex_gui_mode_buttons_inline;
+	gtk_text_view_set_wrap_mode (GTK_TEXT_VIEW (topic),
+		wrap ? GTK_WRAP_WORD_CHAR : GTK_WRAP_NONE);
+
+	topic_scroll = gtk_widget_get_parent (topic);
+	hbox = topic_scroll ? gtk_widget_get_parent (topic_scroll) : NULL;
+	mode_hbox = gtk_widget_get_parent (gui->topicbutton_box);
+
+	if (mode_hbox && hbox)
+	{
+		desired_parent = prefs.hex_gui_mode_buttons_inline ? hbox : vbox;
+		current_parent = gtk_widget_get_parent (mode_hbox);
+		if (current_parent && current_parent != desired_parent)
+		{
+			g_object_ref (mode_hbox);
+			gtk_container_remove (GTK_CONTAINER (current_parent), mode_hbox);
+			gtk_box_pack_start (GTK_BOX (desired_parent), mode_hbox, 0, 0, 0);
+			g_object_unref (mode_hbox);
+		}
+	}
+
+	mg_topicbar_update_height (topic);
+}
+
 /* check if a word is clickable */
 
 static int
@@ -4004,8 +4061,12 @@ mg_create_userlist (session_gui *gui, GtkWidget *box)
         gtk_widget_set_margin_end (gui->namelistinfo, 0);
         gtk_widget_set_hexpand (gui->namelistinfo, TRUE);
         gtk_widget_set_halign (gui->namelistinfo, GTK_ALIGN_FILL);
+        /* always pack it so the preference can be toggled without a
+           restart; visibility is controlled explicitly */
+        gtk_widget_set_no_show_all (gui->namelistinfo, TRUE);
+        gtk_box_pack_start (GTK_BOX (vbox), gui->namelistinfo, 0, 0, 0);
         if (prefs.hex_gui_ulist_count)
-                gtk_box_pack_start (GTK_BOX (vbox), gui->namelistinfo, 0, 0, 0);
+                gtk_widget_show (gui->namelistinfo);
 
         gui->user_tree = ulist = userlist_create (vbox);
 
@@ -5233,6 +5294,10 @@ mg_apply_setup (void)
                 sess = list->data;
                 gtk_xtext_set_time_stamp (sess->res->buffer, prefs.hex_stamp_text);
                 ((xtext_buffer *)sess->res->buffer)->needs_recalc = TRUE;
+                /* the attribute lists were just recreated, so re-apply the
+                   color matching each tab's activity state */
+                if (sess->res->tab)
+                        chan_set_color (sess->res->tab, mg_attr_list_for_tab_state (sess->tab_state));
                 if (!sess->gui->is_tab || !done_main)
                         mg_place_userlist_and_chanview (sess->gui);
                 if (sess->gui->is_tab)
@@ -5275,6 +5340,49 @@ fe_buttons_update (session *sess)
                 gtk_widget_hide (sess->gui->button_box);
 }
 
+/* tab label for a session that has no joined channel: the channel we are
+ * waiting to join in parentheses, or "<none>". tbuf must hold CHANLEN+6. */
+
+static void
+mg_tab_pending_name (session *sess, char *tbuf)
+{
+        if (sess->waitchannel[0])
+        {
+                if (prefs.hex_gui_tab_trunc > 2 && g_utf8_strlen (sess->waitchannel, -1) > prefs.hex_gui_tab_trunc)
+                {
+                        /* truncate long channel names */
+                        tbuf[0] = '(';
+                        strcpy (tbuf + 1, sess->waitchannel);
+                        g_utf8_offset_to_pointer(tbuf, prefs.hex_gui_tab_trunc)[0] = 0;
+                        strcat (tbuf, "..)");
+                } else
+                {
+                        sprintf (tbuf, "(%s)", sess->waitchannel);
+                }
+        }
+        else
+                strcpy (tbuf, _("<none>"));
+}
+
+/* re-apply the tab label truncation preference to a session's tab */
+
+static void
+mg_retrunc_tab (session *sess)
+{
+        char tbuf[CHANLEN+6];
+
+        if (!sess->res->tab)
+                return;
+
+        if (sess->channel[0])
+                chan_rename (sess->res->tab, sess->channel, prefs.hex_gui_tab_trunc);
+        else
+        {
+                mg_tab_pending_name (sess, tbuf);
+                chan_rename (sess->res->tab, tbuf, prefs.hex_gui_tab_trunc);
+        }
+}
+
 void
 fe_clear_channel (session *sess)
 {
@@ -5283,22 +5391,7 @@ fe_clear_channel (session *sess)
 
         if (sess->gui->is_tab)
         {
-                if (sess->waitchannel[0])
-                {
-                        if (prefs.hex_gui_tab_trunc > 2 && g_utf8_strlen (sess->waitchannel, -1) > prefs.hex_gui_tab_trunc)
-                        {
-                                /* truncate long channel names */
-                                tbuf[0] = '(';
-                                strcpy (tbuf + 1, sess->waitchannel);
-                                g_utf8_offset_to_pointer(tbuf, prefs.hex_gui_tab_trunc)[0] = 0;
-                                strcat (tbuf, "..)");
-                        } else
-                        {
-                                sprintf (tbuf, "(%s)", sess->waitchannel);
-                        }
-                }
-                else
-                        strcpy (tbuf, _("<none>"));
+                mg_tab_pending_name (sess, tbuf);
                 chan_rename (sess->res->tab, tbuf, prefs.hex_gui_tab_trunc);
         }
 
@@ -5422,6 +5515,110 @@ fe_set_channel (session *sess)
                 chan_rename (sess->res->tab, sess->channel, prefs.hex_gui_tab_trunc);
 }
 
+static void
+mg_apply_live_prefs_to_gui (session_gui *gui, session *sess, const mg_live_prefs *changes)
+{
+        if (changes->meters)
+                mg_update_meters (gui);
+
+        if (changes->ulist_columns && gui->user_tree)
+                userlist_rebuild_columns (gui->user_tree);
+
+        if (changes->ulist_count && gui->namelistinfo)
+        {
+                if (prefs.hex_gui_ulist_count)
+                        gtk_widget_show (gui->namelistinfo);
+                else
+                        gtk_widget_hide (gui->namelistinfo);
+        }
+
+        if (changes->input_box && gui->nick_box)
+        {
+                if (prefs.hex_gui_input_nick)
+                        gtk_widget_show (gui->nick_box);
+                else
+                        gtk_widget_hide (gui->nick_box);
+        }
+
+        /* refresh the access icon; re-filling the user list rows can
+           clear it as a side effect, so restore it here too */
+        if ((changes->input_box || changes->ulist_rows) && sess && is_session (sess))
+        {
+                if (sess->type == SESS_DIALOG)
+                        mg_set_access_icon (gui, NULL, sess->server->is_away);
+                else
+                        mg_set_access_icon (gui, get_user_icon (sess->server, sess->me), sess->server->is_away);
+        }
+
+        if (changes->topic_bar)
+                mg_update_topicbar_layout (gui);
+
+        if (changes->transparency && gui->window)
+                gtk_widget_set_opacity (gui->window, (prefs.hex_gui_transparency / 255.));
+}
+
+/* apply preference changes that used to require a restart. called by
+ * setup.c after the new prefs have been committed. */
+
+void
+mg_apply_live_prefs (const mg_live_prefs *changes)
+{
+        GSList *list;
+        session *sess;
+        int done_main = FALSE;
+
+        if (!changes)
+                return;
+
+        /* the tab bar / channel tree lives in the shared tab window */
+        if (mg_gui && mg_gui->chanview)
+        {
+                if (changes->tab_resort)
+                {
+                        chanview_set_sorted (mg_gui->chanview, prefs.hex_gui_tab_sort);
+                        chanview_resort (mg_gui->chanview);
+                }
+                if (changes->tab_trunc)
+                        chanview_set_trunc_len (mg_gui->chanview, prefs.hex_gui_tab_trunc);
+                if (changes->chanview || changes->tab_resort)
+                {
+                        chanview_set_use_icons (mg_gui->chanview,
+                                                                                        prefs.hex_gui_tab_icons && (pix_tree_channel || pix_tree_dialog ||
+                                                                                                                                                                 pix_tree_server || pix_tree_util));
+                        /* rebuild the tab bar / tree widgets from the model */
+                        chanview_set_impl (mg_gui->chanview, prefs.hex_gui_tab_layout);
+                }
+        }
+
+        list = sess_list;
+        while (list)
+        {
+                sess = list->data;
+
+                if (changes->tab_trunc)
+                        mg_retrunc_tab (sess);
+                if (changes->ulist_sort)
+                        userlist_apply_sort (sess);
+                if (changes->ulist_rows)
+                        userlist_refill (sess);
+
+                if (sess->gui->is_tab)
+                {
+                        /* only apply to the shared tab window once, using the
+                           front-most session for session-dependent bits */
+                        if (!done_main)
+                        {
+                                done_main = TRUE;
+                                mg_apply_live_prefs_to_gui (sess->gui, current_tab, changes);
+                        }
+                }
+                else
+                        mg_apply_live_prefs_to_gui (sess->gui, sess, changes);
+
+                list = list->next;
+        }
+}
+
 void
 fe_set_typing (session *sess, const char *nick, const char *state)
 {

src/fe-gtk/maingui.h

@@ -37,6 +37,24 @@ GtkWidget *mg_create_generic_tab (char *name, char *title, int force_toplevel, i
 void mg_set_title (GtkWidget *button, char *title);
 void mg_set_access_icon (session_gui *gui, GdkPixbuf *pix, gboolean away);
 void mg_apply_setup (void);
+
+/* which parts of the GUI need a live rebuild after a preferences change */
+typedef struct
+{
+	unsigned int chanview:1;			/* rebuild the tab bar / channel tree */
+	unsigned int tab_resort:1;		/* re-sort channel tabs */
+	unsigned int tab_trunc:1;			/* re-truncate tab labels */
+	unsigned int ulist_columns:1;	/* rebuild user list columns */
+	unsigned int ulist_rows:1;		/* re-fill user list rows */
+	unsigned int ulist_sort:1;		/* re-apply user list sort order */
+	unsigned int ulist_count:1;		/* user count label visibility */
+	unsigned int meters:1;				/* rebuild lag/throttle meters */
+	unsigned int input_box:1;			/* nick box visibility and access icon */
+	unsigned int topic_bar:1;			/* topic wrap mode and mode button placement */
+	unsigned int transparency:1;	/* main window opacity */
+} mg_live_prefs;
+
+void mg_apply_live_prefs (const mg_live_prefs *changes);
 void mg_apply_session_font_prefs (session_gui *gui);
 void mg_close_sess (session *);
 void mg_tab_close (session *sess);

src/fe-gtk/setup.c

@@ -1045,28 +1045,30 @@ setup_create_spin (GtkWidget *table, int row, const setting *set)
         return wid;
 }
 
+static guint setup_trans_apply_tag = 0;
+/* the window opacity the dialog opened with, so cancelling can undo the
+ * live preview done by the slider */
+static int setup_transparency_snapshot;
+
 static gint
-setup_apply_trans (int *tag)
+setup_apply_trans (gpointer userdata)
 {
         prefs.hex_gui_transparency = setup_prefs.hex_gui_transparency;
-        gtk_widget_set_opacity (current_sess->gui->window,
-                                                        (prefs.hex_gui_transparency / 255.));
+        if (current_sess)
+                gtk_widget_set_opacity (current_sess->gui->window,
+                                                                (prefs.hex_gui_transparency / 255.));
 
-        *tag = 0;
+        setup_trans_apply_tag = 0;
         return 0;
 }
 
 static void
 setup_hscale_cb (GtkRange *wid, const setting *set)
 {
-        static int tag = 0;
-
         setup_set_int (&setup_prefs, set, (int) gtk_range_get_value (wid));
 
-        if (tag == 0)
-        {
-                tag = g_idle_add ((GSourceFunc) setup_apply_trans, &tag);
-        }
+        if (setup_trans_apply_tag == 0)
+                setup_trans_apply_tag = g_idle_add ((GSourceFunc) setup_apply_trans, NULL);
 }
 
 static void
@@ -1091,7 +1093,8 @@ setup_create_hscale (GtkWidget *table, int row, const setting *set)
 
 #ifndef WIN32 /* Windows always supports this */
         /* Only used for transparency currently */
-        if (!gdk_screen_is_composited (gtk_widget_get_screen (current_sess->gui->window)))
+        if (current_sess &&
+                 !gdk_screen_is_composited (gtk_widget_get_screen (current_sess->gui->window)))
                 gtk_widget_set_sensitive (wid, FALSE);
 #endif
 }
@@ -2293,7 +2296,9 @@ setup_apply (struct zoitechatprefs *pr)
 	ThemeChangedEvent event;
 	struct zoitechatprefs old_prefs = prefs;
 	int old_dark_mode = prefs.hex_gui_dark_mode;
+	mg_live_prefs live_changes;
 
+	memset (&live_changes, 0, sizeof (live_changes));
 
 #define DIFF(a) (pr->a != prefs.a)
 
@@ -2301,40 +2306,49 @@ setup_apply (struct zoitechatprefs *pr)
         if (DIFF (hex_gui_lang))
                 noapply = TRUE;
 #endif
-        if (DIFF (hex_gui_compact))
-                noapply = TRUE;
-        if (DIFF (hex_gui_input_icon))
-                noapply = TRUE;
-        if (DIFF (hex_gui_input_nick))
-                noapply = TRUE;
-        if (DIFF (hex_gui_lagometer))
-                noapply = TRUE;
-        if (DIFF (hex_gui_mode_buttons_inline))
-                noapply = TRUE;
-        if (DIFF (hex_gui_tab_icons))
-                noapply = TRUE;
-        if (DIFF (hex_gui_tab_closebuttons))
-                noapply = TRUE;
+        /* server tabs are only created when a connection is opened, so
+           existing connections keep their current tabs until a restart;
+           the channel tree indentation is still re-applied below */
         if (DIFF (hex_gui_tab_server))
+        {
                 noapply = TRUE;
-        if (DIFF (hex_gui_tab_small))
-                noapply = TRUE;
+                live_changes.chanview = TRUE;
+        }
+
+        if (DIFF (hex_gui_compact))
+        {
+                live_changes.chanview = TRUE;
+                live_changes.ulist_columns = TRUE;
+        }
+        if (DIFF (hex_gui_input_icon) || DIFF (hex_gui_input_nick))
+                live_changes.input_box = TRUE;
+        if (DIFF (hex_gui_lagometer) || DIFF (hex_gui_throttlemeter))
+                live_changes.meters = TRUE;
+        if (DIFF (hex_gui_mode_buttons_inline) || DIFF (hex_gui_topicbar_multiline))
+                live_changes.topic_bar = TRUE;
+        if (DIFF (hex_gui_tab_icons) || DIFF (hex_gui_tab_closebuttons) ||
+                 DIFF (hex_gui_tab_small))
+                live_changes.chanview = TRUE;
         if (DIFF (hex_gui_tab_sort))
-                noapply = TRUE;
+                live_changes.tab_resort = TRUE;
         if (DIFF (hex_gui_tab_trunc))
-                noapply = TRUE;
-        if (DIFF (hex_gui_throttlemeter))
-                noapply = TRUE;
-        if (DIFF (hex_gui_topicbar_multiline))
-                noapply = TRUE;
+                live_changes.tab_trunc = TRUE;
         if (DIFF (hex_gui_ulist_count))
-                noapply = TRUE;
+                live_changes.ulist_count = TRUE;
         if (DIFF (hex_gui_ulist_icons))
-                noapply = TRUE;
+                live_changes.ulist_rows = TRUE;
         if (DIFF (hex_gui_ulist_show_hosts))
-                noapply = TRUE;
+        {
+                live_changes.ulist_columns = TRUE;
+                live_changes.ulist_rows = TRUE; /* hostnames may be stale */
+        }
         if (DIFF (hex_gui_ulist_sort))
-                noapply = TRUE;
+                live_changes.ulist_sort = TRUE;
+        /* compare against the pre-dialog value: the slider previews the
+           opacity live on the current window only, so OK still needs to
+           apply it to the other windows */
+        if (pr->hex_gui_transparency != setup_transparency_snapshot)
+                live_changes.transparency = TRUE;
 
         if ((pr->hex_gui_tab_pos == 5 || pr->hex_gui_tab_pos == 6) &&
                  pr->hex_gui_tab_layout == 2 && pr->hex_gui_tab_pos != prefs.hex_gui_tab_pos)
@@ -2378,6 +2392,8 @@ setup_apply (struct zoitechatprefs *pr)
 
 	theme_manager_dispatch_setup_apply (&event);
 
+	mg_apply_live_prefs (&live_changes);
+
         if (noapply)
                 fe_message (_("Some settings were changed that require a"
                                                 " restart to take full effect."), FE_MSG_WARN);
@@ -2410,6 +2426,9 @@ setup_ok_cb (GtkWidget *but, GtkWidget *win)
         if (save_result.success)
         {
                 theme_preferences_stage_commit ();
+                /* the previewed values were accepted, so the close handler
+                   must not revert them */
+                setup_transparency_snapshot = prefs.hex_gui_transparency;
                 gtk_widget_destroy (win);
                 return;
         }
@@ -2472,6 +2491,24 @@ setup_close_cb (GtkWidget *win, GtkWidget **swin)
 {
         *swin = NULL;
 
+        /* drop any pending transparency preview and undo the previewed
+           opacity when the dialog is cancelled; after OK the snapshot
+           was updated so this is a no-op */
+        if (setup_trans_apply_tag)
+        {
+                g_source_remove (setup_trans_apply_tag);
+                setup_trans_apply_tag = 0;
+        }
+        if (prefs.hex_gui_transparency != setup_transparency_snapshot)
+        {
+                mg_live_prefs revert_changes;
+
+                prefs.hex_gui_transparency = setup_transparency_snapshot;
+                memset (&revert_changes, 0, sizeof (revert_changes));
+                revert_changes.transparency = TRUE;
+                mg_apply_live_prefs (&revert_changes);
+        }
+
         theme_preferences_stage_discard ();
 
         if (font_dialog)
@@ -2493,6 +2530,7 @@ setup_open (void)
         memcpy (&setup_prefs, &prefs, sizeof (prefs));
 
         color_change = FALSE;
+        setup_transparency_snapshot = prefs.hex_gui_transparency;
         theme_preferences_stage_begin ();
         setup_window = setup_window_open ();
 

src/fe-gtk/theme/theme-preferences.c

@@ -106,6 +106,11 @@ typedef struct
         gboolean staged_dirty[THEME_TOKEN_COUNT];
         GdkRGBA snapshot[THEME_TOKEN_COUNT];
         GdkRGBA staged[THEME_TOKEN_COUNT];
+        /* the GTK3 theme selection is previewed live from the combo, so
+         * remember what was active when the dialog opened in order to
+         * restore it when the dialog is cancelled */
+        char gtk3_theme_snapshot[sizeof ((struct zoitechatprefs *) 0)->hex_gui_gtk3_theme];
+        int gtk3_variant_snapshot;
 } theme_preferences_stage_state;
 
 static theme_preferences_stage_state theme_preferences_stage;
@@ -204,6 +209,11 @@ theme_preferences_stage_begin (void)
         memset (&theme_preferences_stage, 0, sizeof (theme_preferences_stage));
         theme_preferences_stage.active = TRUE;
 
+        g_strlcpy (theme_preferences_stage.gtk3_theme_snapshot,
+                   prefs.hex_gui_gtk3_theme,
+                   sizeof (theme_preferences_stage.gtk3_theme_snapshot));
+        theme_preferences_stage.gtk3_variant_snapshot = prefs.hex_gui_gtk3_variant;
+
         for (token = THEME_TOKEN_MIRC_0; token < THEME_TOKEN_COUNT; token++)
         {
                 GdkRGBA rgba;
@@ -237,12 +247,36 @@ theme_preferences_stage_commit (void)
         memset (&theme_preferences_stage, 0, sizeof (theme_preferences_stage));
 }
 
+/* undo a live GTK3 theme preview: put the selection that was active when
+ * the dialog opened back and re-apply it */
+static void
+theme_preferences_stage_restore_gtk3 (void)
+{
+        if (g_strcmp0 (prefs.hex_gui_gtk3_theme, theme_preferences_stage.gtk3_theme_snapshot) == 0 &&
+            prefs.hex_gui_gtk3_variant == theme_preferences_stage.gtk3_variant_snapshot)
+                return;
+
+        g_strlcpy (prefs.hex_gui_gtk3_theme,
+                   theme_preferences_stage.gtk3_theme_snapshot,
+                   sizeof (prefs.hex_gui_gtk3_theme));
+        prefs.hex_gui_gtk3_variant = theme_preferences_stage.gtk3_variant_snapshot;
+
+        theme_gtk3_apply_current (NULL);
+        theme_manager_dispatch_changed (THEME_CHANGED_REASON_THEME_PACK |
+                                        THEME_CHANGED_REASON_PALETTE |
+                                        THEME_CHANGED_REASON_WIDGET_STYLE |
+                                        THEME_CHANGED_REASON_USERLIST |
+                                        THEME_CHANGED_REASON_MODE);
+}
+
 void
 theme_preferences_stage_discard (void)
 {
         if (!theme_preferences_stage.active)
                 return;
 
+        /* restore the GTK3 theme first so the color snapshot below wins */
+        theme_preferences_stage_restore_gtk3 ();
         theme_preferences_stage_sync_runtime_to_snapshot ();
         memset (&theme_preferences_stage, 0, sizeof (theme_preferences_stage));
 }

src/fe-gtk/userlistgui.c

@@ -796,16 +796,12 @@ userlist_store_color (GtkListStore *store, GtkTreeIter *iter, ThemeSemanticToken
 	}
 }
 
-GtkListStore *
-userlist_create_model (session *sess)
+static void
+userlist_model_set_sort (GtkListStore *store, session *sess)
 {
-	GtkListStore *store;
 	GtkTreeIterCompareFunc cmp_func;
 	GtkSortType sort_type;
 
-	store = gtk_list_store_new (6, GDK_TYPE_PIXBUF, G_TYPE_STRING, G_TYPE_STRING,
-										G_TYPE_STRING, G_TYPE_POINTER, THEME_GTK_COLOR_TYPE);
-
 	switch (prefs.hex_gui_ulist_sort)
 	{
 	case 0:
@@ -825,18 +821,77 @@ userlist_create_model (session *sess)
 		sort_type = GTK_SORT_DESCENDING;
 		break;
 	default:
-		/* No sorting */
+		/* No sorting; rows keep their current order and new rows
+		   go wherever they are inserted */
+		gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE(store),
+							GTK_TREE_SORTABLE_UNSORTED_SORT_COLUMN_ID, GTK_SORT_ASCENDING);
 		gtk_tree_sortable_set_default_sort_func (GTK_TREE_SORTABLE(store), NULL, NULL, NULL);
-		return store;
+		return;
 	}
 
 	gtk_tree_sortable_set_default_sort_func (GTK_TREE_SORTABLE(store), cmp_func, sess, NULL);
 	gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE(store),
 						GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, sort_type);
+}
+
+GtkListStore *
+userlist_create_model (session *sess)
+{
+	GtkListStore *store;
+
+	store = gtk_list_store_new (6, GDK_TYPE_PIXBUF, G_TYPE_STRING, G_TYPE_STRING,
+										G_TYPE_STRING, G_TYPE_POINTER, THEME_GTK_COLOR_TYPE);
+	userlist_model_set_sort (store, sess);
 
 	return store;
 }
 
+void
+userlist_apply_sort (session *sess)
+{
+	if (!sess->res || !sess->res->user_model)
+		return;
+
+	userlist_model_set_sort (sess->res->user_model, sess);
+}
+
+/* remove and re-insert every row, so per-row content that depends on
+ * preferences (mode icons vs. text prefixes, hostnames) is rebuilt */
+void
+userlist_refill (session *sess)
+{
+	GtkTreeModel *model;
+	GtkTreeIter iter;
+	GSList *users = NULL;
+	GSList *it;
+	struct User *user;
+
+	if (!sess->res || !sess->res->user_model)
+		return;
+
+	model = GTK_TREE_MODEL (sess->res->user_model);
+	if (gtk_tree_model_get_iter_first (model, &iter))
+	{
+		do
+		{
+			gtk_tree_model_get (model, &iter, COL_USER, &user, -1);
+			if (user)
+				users = g_slist_prepend (users, user);
+		}
+		while (gtk_tree_model_iter_next (model, &iter));
+	}
+
+	fe_userlist_clear (sess);
+
+	/* fe_userlist_insert() prepends, so inserting in reverse display
+	   order restores the on-screen order for unsorted lists; sorted
+	   models position the rows themselves */
+	for (it = users; it; it = it->next)
+		fe_userlist_insert (sess, it->data, FALSE);
+
+	g_slist_free (users);
+}
+
 static void
 userlist_add_columns (GtkTreeView * treeview)
 {
@@ -906,6 +961,23 @@ userlist_add_columns (GtkTreeView * treeview)
 	}
 }
 
+void
+userlist_rebuild_columns (GtkWidget *treeview)
+{
+	GList *columns;
+	GList *it;
+
+	if (!treeview)
+		return;
+
+	columns = gtk_tree_view_get_columns (GTK_TREE_VIEW (treeview));
+	for (it = columns; it; it = it->next)
+		gtk_tree_view_remove_column (GTK_TREE_VIEW (treeview), it->data);
+	g_list_free (columns);
+
+	userlist_add_columns (GTK_TREE_VIEW (treeview));
+}
+
 static gint
 userlist_click_cb (GtkWidget *widget, GdkEventButton *event, gpointer userdata)
 {

src/fe-gtk/userlistgui.h

@@ -24,6 +24,9 @@ void userlist_set_value (GtkWidget *treeview, gfloat val);
 gfloat userlist_get_value (GtkWidget *treeview);
 GtkWidget *userlist_create (GtkWidget *box);
 GtkListStore *userlist_create_model (session *sess);
+void userlist_apply_sort (session *sess);
+void userlist_refill (session *sess);
+void userlist_rebuild_columns (GtkWidget *treeview);
 void userlist_show (session *sess);
 void userlist_select (session *sess, char *name);
 void fe_userlist_set_typing (session *sess, const char *nick, const char *state);