[gtk/wip/baedert/for-master] label: Try to avoid a pango_layout_get_extents call

[Timm Bäder <baedert src gnome org>]

commit 1fadcb1d44b57f830daeb8e11429c972f6732c32
Author: Timm Bäder <mail baedert org>
Date:   Sat Aug 15 17:03:46 2020 +0200

    label: Try to avoid a pango_layout_get_extents call
    
    Measuring text is quite expensive, so only do this if really necessary.

 gtk/gtklabel.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtklabel.c b/gtk/gtklabel.c
index 1e9f566346..378069d8a5 100644
--- a/gtk/gtklabel.c
+++ b/gtk/gtklabel.c
@@ -2782,7 +2782,6 @@ gtk_label_get_measuring_layout (GtkLabel    *self,
                                 PangoLayout *existing_layout,
                                 int          width)
 {
-  PangoRectangle rect;
   PangoLayout *copy;
 
   if (existing_layout != NULL)
@@ -2820,13 +2819,17 @@ gtk_label_get_measuring_layout (GtkLabel    *self,
    * can just return the current layout, because for measuring purposes, it will be
    * identical.
    */
-  pango_layout_get_extents (self->layout, NULL, &rect);
-  if ((width == -1 || rect.width <= width) &&
-      !pango_layout_is_wrapped (self->layout) &&
+  if (!pango_layout_is_wrapped (self->layout) &&
       !pango_layout_is_ellipsized (self->layout))
     {
-      g_object_ref (self->layout);
-      return self->layout;
+      PangoRectangle rect;
+
+      if (width == -1)
+        return g_object_ref (self->layout);
+
+      pango_layout_get_extents (self->layout, NULL, &rect);
+      if (rect.width <= width)
+        return g_object_ref (self->layout);
     }
 
   copy = pango_layout_copy (self->layout);