Fix xtext resize paint clipping

src/fe-gtk/xtext.c

@@ -1283,13 +1283,25 @@ gtk_xtext_get_preferred_height_for_width (GtkWidget *widget, gint width,
 	*natural = requisition.height;
 }
 
+static void
+gtk_xtext_invalidate_resize (GtkXText *xtext, xtext_buffer *buf)
+{
+	buf->pagetop_ent = NULL;
+	dontscroll (buf);
+	xtext->force_render = TRUE;
+}
+
 static void
 gtk_xtext_size_allocate (GtkWidget * widget, GtkAllocation * allocation)
 {
 	GtkXText *xtext = GTK_XTEXT (widget);
 	int height_only = FALSE;
+	gboolean resized;
 	GdkWindow *window;
 
+	resized = allocation->width != xtext->buffer->window_width ||
+		allocation->height != xtext->buffer->window_height;
+
 	if (allocation->width == xtext->buffer->window_width)
 		height_only = TRUE;
 
@@ -1315,6 +1327,11 @@ gtk_xtext_size_allocate (GtkWidget * widget, GtkAllocation * allocation)
 			xtext_adj_set_value (xtext->adj,
 				xtext_adj_get_upper (xtext->adj) -
 				xtext_adj_get_page_size (xtext->adj));
+		if (resized)
+		{
+			gtk_xtext_invalidate_resize (xtext, xtext->buffer);
+			gtk_widget_queue_draw (widget);
+		}
 	}
 }
 
@@ -1587,6 +1604,17 @@ gtk_xtext_render (GtkWidget *widget, GdkRectangle *area, cairo_t *cr)
 
 	gtk_widget_get_allocation (widget, &allocation);
 
+	if (xtext->force_render && area->x == 0 && area->y == 0 &&
+		 area->height == allocation.height &&
+		 area->width == allocation.width)
+	{
+		xtext->force_render = FALSE;
+	}
+	else if (xtext->force_render)
+	{
+		gtk_widget_queue_draw (widget);
+	}
+
 	if (area->x == 0 && area->y == 0 &&
 		 area->height == allocation.height &&
 		 area->width == allocation.width)
@@ -4302,13 +4330,9 @@ gtk_xtext_calc_lines (xtext_buffer *buf, int fire_signal)
 	int width;
 	int height;
 	int lines;
-	GdkWindow *window;
 
-	window = gtk_widget_get_window (GTK_WIDGET (buf->xtext));
-	if (!window)
-		return;
-	height = gdk_window_get_height (window);
-	width = gdk_window_get_width (window);
+	height = buf->window_height;
+	width = buf->window_width;
 	width -= MARGIN;
 
 	if (width < 30 || height < buf->xtext->fontsize || width < buf->indent + 30)
@@ -4520,6 +4544,7 @@ gtk_xtext_render_page (GtkXText * xtext)
 	int startline = adj_value;
 	int pos, overlap;
 	GdkWindow *window;
+	GtkAllocation allocation;
 
 	if(!gtk_widget_get_realized(GTK_WIDGET(xtext)))
 	  return;
@@ -4530,8 +4555,9 @@ gtk_xtext_render_page (GtkXText * xtext)
 	window = gtk_widget_get_window (GTK_WIDGET (xtext));
 	if (!window)
 		return;
-	width = gdk_window_get_width (window);
-	height = gdk_window_get_height (window);
+	gtk_widget_get_allocation (GTK_WIDGET (xtext), &allocation);
+	width = allocation.width;
+	height = allocation.height;
 
 	if (width < 34 || height < xtext->fontsize || width < xtext->buffer->indent + 32)
 		return;
@@ -5742,6 +5768,7 @@ gtk_xtext_buffer_show (GtkXText *xtext, xtext_buffer *buf, int render)
 {
 	int w, h;
 	GdkWindow *window;
+	GtkAllocation allocation;
 
 	buf->xtext = xtext;
 
@@ -5768,8 +5795,9 @@ gtk_xtext_buffer_show (GtkXText *xtext, xtext_buffer *buf, int render)
 	window = gtk_widget_get_window (GTK_WIDGET (xtext));
 	if (!window)
 		return;
-	h = gdk_window_get_height (window);
-	w = gdk_window_get_width (window);
+	gtk_widget_get_allocation (GTK_WIDGET (xtext), &allocation);
+	h = allocation.height;
+	w = allocation.width;
 
 	/* after a font change */
 	if (buf->needs_recalc)
@@ -5807,6 +5835,10 @@ gtk_xtext_buffer_show (GtkXText *xtext, xtext_buffer *buf, int render)
 
 	if (render)
 	{
+		gboolean resized;
+
+		resized = buf->window_width != w || buf->window_height != h;
+
 		/* did the window change size since this buffer was last shown? */
 		if (buf->window_width != w)
 		{
@@ -5827,6 +5859,9 @@ gtk_xtext_buffer_show (GtkXText *xtext, xtext_buffer *buf, int render)
 			gtk_xtext_adjustment_set (buf, FALSE);
 		}
 
+		if (resized)
+			gtk_xtext_invalidate_resize (xtext, buf);
+
 		gtk_xtext_render_page (xtext);
 		{
 			GtkAllocation allocation;