Correctly fix the vertical scroller redraw issue.

Source/CandidateUI/VTVerticalCandidateController.m

@@ -41,7 +41,6 @@ static const CGFloat kCandidateTextLeftMargin = 8.0;
 - (BOOL)scrollPageByOne:(BOOL)forward;
 - (BOOL)moveSelectionByOne:(BOOL)forward;
 - (void)layoutCandidateView;
-- (void)forceUpdateVerticalScroller;
 @end
 
 @implementation VTVerticalCandidateController
@@ -254,6 +253,13 @@ static const CGFloat kCandidateTextLeftMargin = 8.0;
         NSInteger firstVisibleRow = [_tableView rowAtPoint:[_scrollView documentVisibleRect].origin];
         _keyLabelStripView.highlightedIndex = selectedRow - firstVisibleRow;
         [_keyLabelStripView setNeedsDisplay:YES];
+
+        // fix a subtle OS X "bug" that, since we force the scroller to appear,
+        // scrolling sometimes shows a temporarily "broken" scroll bar
+        // (but quickly disappears)
+        if ([_scrollView hasVerticalScroller]) {
+            [[_scrollView verticalScroller] setNeedsDisplay];
+        }
     }    
 }
 
@@ -392,15 +398,4 @@ static const CGFloat kCandidateTextLeftMargin = 8.0;
     [_scrollView setFrame:NSMakeRect(stripWidth + 1.0, 0.0, tableViewStartWidth, windowHeight)];
     [[self window] setFrame:frameRect display:YES];
 }
-
-- (void)forceUpdateVerticalScroller
-{
-    [NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(deferredForceUpdateVerticalScroller) object:nil];
-    [self performSelector:@selector(deferredForceUpdateVerticalScroller) withObject:nil afterDelay:0.0];
-}
-
-- (void)deferredForceUpdateVerticalScroller
-{
-    [[_scrollView verticalScroller] setNeedsDisplay];
-}
 @end