[f-spot] fix some compilation warnings

[Stephane Delcroix <sdelcroix src gnome org>]

commit 6c88a875c427a773a53b86f0390d0447d2c359a5
Author: Stephane Delcroix <stephane delcroix org>
Date:   Tue Jun 16 09:47:39 2009 +0200

    fix some compilation warnings

 src/Widgets/CheckPattern.cs |   12 ++++++++++++
 src/Widgets/ImageView.cs    |   14 +++++---------
 2 files changed, 17 insertions(+), 9 deletions(-)
---
diff --git a/src/Widgets/CheckPattern.cs b/src/Widgets/CheckPattern.cs
index 53fa5eb..79f6444 100644
--- a/src/Widgets/CheckPattern.cs
+++ b/src/Widgets/CheckPattern.cs
@@ -79,6 +79,18 @@ namespace FSpot.Widgets
 			       (left.color1 != left.color2 && left.check_size != right.check_size);
 		}
 
+		public override int GetHashCode ()
+		{
+			return (int)color1 ^ (int)color2 ^ check_size;
+		}
+
+		public override bool Equals (object other)
+		{
+			if (!(other is CheckPattern))
+				return false;
+			return this == (CheckPattern)other;
+		}
+
 		static uint s_to_h (string color)
 		{
 			return (uint)(Byte.Parse (color.Substring (1,2), System.Globalization.NumberStyles.AllowHexSpecifier) << 16) +
diff --git a/src/Widgets/ImageView.cs b/src/Widgets/ImageView.cs
index 1b7593b..9209b4f 100644
--- a/src/Widgets/ImageView.cs
+++ b/src/Widgets/ImageView.cs
@@ -550,7 +550,6 @@ namespace FSpot.Widgets
 					  (evnt.Direction == ScrollDirection.Left) ? -x_incr : (evnt.Direction == ScrollDirection.Right) ? x_incr : 0);	
 				return true;
 			}
-			return base.OnScrollEvent (evnt);
 		}
 
 		protected override bool OnKeyPressEvent (EventKey key)
@@ -811,7 +810,6 @@ namespace FSpot.Widgets
 
 		void OnSelectionUnrealized ()
 		{
-			selection_gc.Unref ();
 			selection_gc = null;
 		}
 
@@ -821,10 +819,10 @@ namespace FSpot.Widgets
 				return false;
 
 			Rectangle win_selection = ImageCoordsToWindow (selection);
-			Region r = new Region ();
-			r.UnionWithRect (win_selection);
-			evnt.Region.Subtract (r);
-			r.Destroy ();
+			using (Region r = new Region ()) {
+				r.UnionWithRect (win_selection);
+				evnt.Region.Subtract (r);
+			}
 
 			using (Cairo.Context ctx = CairoHelper.Create (GdkWindow)) {
 				ctx.SetSourceRGBA (.5, .5, .5, .7);
@@ -862,11 +860,9 @@ namespace FSpot.Widgets
 			if (evnt.Button != 1)
 				return false;
 
-			if (evnt.Type == EventType.TwoButtonPress) {
+			if (evnt.Type == EventType.TwoButtonPress) 
 				return false;
-			}
 			
-			bool is_new_selection;
 			Point img = WindowCoordsToImage (new Point ((int)evnt.X, (int)evnt.Y));
 			switch (GetDragMode ((int)evnt.X, (int)evnt.Y)) {
 				case DragMode.None: