Don't coalesce scroll wheel events

Since the backend now pops off all input events at once whenever it
tends to the run-loop, it is no longer necessary to coalesce scroll
wheel events.  In fact, without coalescing the scroll wheel (or track
pad) feels a lot smoother.

src/MacVim/MMTextViewHelper.h

@@ -30,7 +30,6 @@ enum {
     BOOL                isAutoscrolling;
     int                 mouseShape;
     NSTrackingRectTag   trackingRectTag;
-    float               scrollWheelAccumulator;
 }
 
 - (void)setTextView:(id)view;

src/MacVim/MMTextViewHelper.m

@@ -33,10 +33,6 @@ static NSTimeInterval MMDragTimerMinInterval = 0.01;
 // The number of pixels in which the drag timer interval changes
 static float MMDragAreaSize = 73.0f;
 
-// Number of seconds to delay before sending scroll wheel events.  (A delay of
-// 0.05 seconds equals an update frequency of 20 Hz.)
-static NSTimeInterval MMScrollWheelDelay = 0.05;
-
 
 @interface MMTextViewHelper (Private)
 - (MMWindowController *)windowController;
@@ -48,7 +44,6 @@ static NSTimeInterval MMScrollWheelDelay = 0.05;
 - (void)dragTimerFired:(NSTimer *)timer;
 - (void)setCursor;
 - (NSRect)trackingRect;
-- (void)handleScrollWheelEvent:(id)event;
 @end
 
 
@@ -271,16 +266,20 @@ static NSTimeInterval MMScrollWheelDelay = 0.05;
     if ([event deltaY] == 0)
         return;
 
-    // Don't send the event straight away because lots of these events may be
-    // received in rapid succession.  Instead, accumulate the events and send
-    // off the scroll total at a predetermined maximum rate.  This avoids
-    // clogging up the DO messaging system on faster machines.
-    if (0 == scrollWheelAccumulator)
-        [self performSelector:@selector(handleScrollWheelEvent:)
-                   withObject:event
-                   afterDelay:MMScrollWheelDelay];
+    int row, col;
+    NSPoint pt = [textView convertPoint:[event locationInWindow] fromView:nil];
+    if ([textView convertPoint:pt toRow:&row column:&col]) {
+        int flags = [event modifierFlags];
+        float dy = [event deltaY];
+        NSMutableData *data = [NSMutableData data];
 
-    scrollWheelAccumulator += [event deltaY];
+        [data appendBytes:&row length:sizeof(int)];
+        [data appendBytes:&col length:sizeof(int)];
+        [data appendBytes:&flags length:sizeof(int)];
+        [data appendBytes:&dy length:sizeof(float)];
+
+        [[self vimController] sendMessage:ScrollWheelMsgID data:data];
+    }
 }
 
 - (void)mouseDown:(NSEvent *)event
@@ -713,26 +712,4 @@ static NSTimeInterval MMScrollWheelDelay = 0.05;
     return rect;
 }
 
-- (void)handleScrollWheelEvent:(id)event
-{
-    if (0 == scrollWheelAccumulator)
-        return;
-
-    int row, col;
-    NSPoint pt = [textView convertPoint:[event locationInWindow] fromView:nil];
-    if ([textView convertPoint:pt toRow:&row column:&col]) {
-        int flags = [event modifierFlags];
-        NSMutableData *data = [NSMutableData data];
-
-        [data appendBytes:&row length:sizeof(int)];
-        [data appendBytes:&col length:sizeof(int)];
-        [data appendBytes:&flags length:sizeof(int)];
-        [data appendBytes:&scrollWheelAccumulator length:sizeof(float)];
-
-        [[self vimController] sendMessage:ScrollWheelMsgID data:data];
-    }
-
-    scrollWheelAccumulator = 0;
-}
-
 @end // MMTextViewHelper (Private)