Index: source/blender/editors/interface/view2d.c
===================================================================
--- source/blender/editors/interface/view2d.c	(revision 25457)
+++ source/blender/editors/interface/view2d.c	(working copy)
@@ -1406,6 +1406,13 @@
 				scrollers->hor_min= MAX2(scrollers->hor_max - V2D_SCROLLER_HANDLE_SIZE, hor.xmin);
 			}
 		}
+
+		/*fix to ensure overun at left doesn't occur */
+		if(scrollers->hor_min <= hor.xmin && scrollers->hor_max <=hor.xmin + V2D_SCROLLER_HANDLE_SIZE) {
+			scrollers->hor_min = hor.xmin;
+			scrollers->hor_max = hor.xmin + V2D_SCROLLER_HANDLE_SIZE;
+		}
+
 		
 		/* check whether sliders can disappear */
 		if(v2d->keeptot) {
@@ -1445,6 +1452,12 @@
 			}
 		}
 		
+		/*fix to ensure overun at bottom doesn't occur */
+		if(scrollers->vert_min <= vert.ymin && scrollers->vert_max <=vert.ymin+ V2D_SCROLLER_HANDLE_SIZE) {
+			scrollers->vert_min = vert.ymin;
+			scrollers->vert_max = vert.ymin + V2D_SCROLLER_HANDLE_SIZE;
+		}
+
 		/* check whether sliders can disappear */
 		if(v2d->keeptot) {
 			if(fac1 <= 0.0f && fac2 >= 1.0f)