Bug#877106: pinta: Pinta 1.6-2 crashes on image scaling and other image manipulation.

[Kentaro Hayashi]

Hi,

It doesn't resove the issue completely,
but the following commit may reduce crash frequency.

  Fix an NRE I randomly hit. 
  
https://github.com/PintaProject/Pinta/commit/1e6197674c1dc653a76f231eb1ace7cf69cdf984

--- a/Pinta.Core/Classes/DocumentWorkspace.cs
+++ b/Pinta.Core/Classes/DocumentWorkspace.cs
@@ -270,7 +270,8 @@
                        
                        zoom = Math.Min (zoom, 3600);
                        
-                       PintaCore.Chrome.Canvas.GdkWindow.FreezeUpdates ();
+                       if (PintaCore.Chrome.Canvas.GdkWindow != null)
+                               PintaCore.Chrome.Canvas.GdkWindow.FreezeUpdates 
();
                        PintaCore.Actions.View.SuspendZoomUpdate ();
                        
                        Gtk.Viewport view = 
(Gtk.Viewport)PintaCore.Chrome.Canvas.Parent;
@@ -336,7 +337,8 @@
                        RecenterView (center_x, center_y);
                        
                        PintaCore.Actions.View.ResumeZoomUpdate ();
-                       PintaCore.Chrome.Canvas.GdkWindow.ThawUpdates ();
+                       if (PintaCore.Chrome.Canvas.GdkWindow != null)
+                               PintaCore.Chrome.Canvas.GdkWindow.ThawUpdates 
();
                }
                #endregion
        }


--- a/Pinta.Core/Classes/DocumentWorkspace.cs
+++ b/Pinta.Core/Classes/DocumentWorkspace.cs
@@ -270,7 +270,8 @@
 			
 			zoom = Math.Min (zoom, 3600);
 			
-			PintaCore.Chrome.Canvas.GdkWindow.FreezeUpdates ();
+			if (PintaCore.Chrome.Canvas.GdkWindow != null)
+				PintaCore.Chrome.Canvas.GdkWindow.FreezeUpdates ();
 			PintaCore.Actions.View.SuspendZoomUpdate ();
 			
 			Gtk.Viewport view = (Gtk.Viewport)PintaCore.Chrome.Canvas.Parent;
@@ -336,7 +337,8 @@
 			RecenterView (center_x, center_y);
 			
 			PintaCore.Actions.View.ResumeZoomUpdate ();
-			PintaCore.Chrome.Canvas.GdkWindow.ThawUpdates ();
+			if (PintaCore.Chrome.Canvas.GdkWindow != null)
+				PintaCore.Chrome.Canvas.GdkWindow.ThawUpdates ();
 		}
 		#endregion
 	}