[gtk+] Don't try to snapshot invisible icons

[Timm Bäder <baedert src gnome org>]

commit 657983cfda4c84b3c9b8490e748b08ccbd47a81f
Author: Timm Bäder <mail baedert org>
Date:   Mon Oct 9 17:38:54 2017 +0200

    Don't try to snapshot invisible icons
    
    These spew criticals when width == 0 || height == 0.

 gtk/gtkicon.c       |    9 +++++----
 gtk/gtkpaned.c      |    9 +++++----
 gtk/gtkrendericon.c |    3 +++
 3 files changed, 13 insertions(+), 8 deletions(-)
---
diff --git a/gtk/gtkicon.c b/gtk/gtkicon.c
index aefd1c7..5424e15 100644
--- a/gtk/gtkicon.c
+++ b/gtk/gtkicon.c
@@ -43,10 +43,11 @@ gtk_icon_snapshot (GtkWidget   *widget,
 
   gtk_widget_get_content_size (widget, &width, &height);
 
-  gtk_css_style_snapshot_icon (style,
-                               snapshot,
-                               width, height,
-                               self->image);
+  if (width > 0 && height > 0)
+    gtk_css_style_snapshot_icon (style,
+                                 snapshot,
+                                 width, height,
+                                 self->image);
 }
 
 static void
diff --git a/gtk/gtkpaned.c b/gtk/gtkpaned.c
index a759190..7af1076 100644
--- a/gtk/gtkpaned.c
+++ b/gtk/gtkpaned.c
@@ -1476,10 +1476,11 @@ gtk_paned_render_handle (GtkGizmo    *gizmo,
 
   gtk_widget_get_content_size (widget, &width, &height);
 
-  gtk_css_style_snapshot_icon (style,
-                               snapshot,
-                               width, height,
-                               GTK_CSS_IMAGE_BUILTIN_PANE_SEPARATOR);
+  if (width > 0 && height > 0)
+    gtk_css_style_snapshot_icon (style,
+                                 snapshot,
+                                 width, height,
+                                 GTK_CSS_IMAGE_BUILTIN_PANE_SEPARATOR);
 
   return FALSE;
 }
diff --git a/gtk/gtkrendericon.c b/gtk/gtkrendericon.c
index 3cecd35..caa7005 100644
--- a/gtk/gtkrendericon.c
+++ b/gtk/gtkrendericon.c
@@ -105,6 +105,9 @@ gtk_css_style_snapshot_icon (GtkCssStyle            *style,
   g_return_if_fail (GTK_IS_CSS_STYLE (style));
   g_return_if_fail (snapshot != NULL);
 
+  if (width == 0.0 || height == 0.0)
+    return;
+
   image = _gtk_css_image_value_get_image (gtk_css_style_get_value (style, GTK_CSS_PROPERTY_ICON_SOURCE));
   if (image == NULL)
     return;