Verified the requested #if HAVE_GTK3 / #if !HAVE_GTK3 alignment branches are already present across the noted src/fe-gtk/ files, then refined the GTK3 join dialog icon alignment by adding a small top margin to better approximate the legacy y = 0.06 alignment behavior.

Removed a lingering commented-out gtk_misc_set_alignment call in servlistgui.c so the remaining legacy alignment calls surfaced by search are all active and guarded.

src/fe-gtk/joind.c

@@ -155,6 +155,7 @@ joind_show_dialog (server *serv)
 #if HAVE_GTK3
 	gtk_widget_set_halign (image1, GTK_ALIGN_CENTER);
 	gtk_widget_set_valign (image1, GTK_ALIGN_START);
+	gtk_widget_set_margin_top (image1, 2);
 #elif !HAVE_GTK3
 	gtk_misc_set_alignment (GTK_MISC (image1), 0.5f, 0.06f);
 #endif

src/fe-gtk/servlistgui.c

@@ -2107,7 +2107,7 @@ servlist_open_networks (void)
 	gtk_table_attach (GTK_TABLE (table1), label7, 0, 1, 4, 5,
 							(GtkAttachOptions) (GTK_FILL),
 							(GtkAttachOptions) (0), 0, 0);
-	gtk_misc_set_alignment (GTK_MISC (label7), 0, 0.5);*/
+	*/
 
 	entry_nick1 = entry1 = gtk_entry_new ();
 	gtk_entry_set_text (GTK_ENTRY (entry1), prefs.hex_irc_nick1);