Fixed: clicking a token would cause the token field to resign first responder status, only to reclaim it on mouse up.

This was caused by the framework's stop DOM event code blurring the field. Now simply refuse to resign first responder status between mouse down and mouse up. Note that this fixes the bug the previous commit did too, but that commit improves other scrolling behaviour so it gets to stay.

AppKit/CPTokenField.j

@@ -78,6 +78,8 @@ var CPThemeStateAutoCompleting          = @"CPThemeStateAutoCompleting",
     CPCharacterSet      _tokenizingCharacterSet @accessors(property=tokenizingCharacterSet);
 
     CPEvent             _mouseDownEvent;
+
+    BOOL                _preventResign;
 }
 
 + (CPCharacterSet)defaultTokenizingCharacterSet
@@ -353,6 +355,9 @@ var CPThemeStateAutoCompleting          = @"CPThemeStateAutoCompleting",
 
 - (BOOL)resignFirstResponder
 {
+    if (_preventResign)
+        return NO;
+
     [self unsetThemeState:CPThemeStateEditing];
 
     [self _updatePlaceholderState];
@@ -397,6 +402,7 @@ var CPThemeStateAutoCompleting          = @"CPThemeStateAutoCompleting",
 
 - (void)mouseDown:(CPEvent)anEvent
 {
+    _preventResign = YES;
     _mouseDownEvent = anEvent;
 
     [self _selectToken:nil byExtendingSelection:NO];
@@ -406,11 +412,13 @@ var CPThemeStateAutoCompleting          = @"CPThemeStateAutoCompleting",
 
 - (void)mouseUp:(CPEvent)anEvent
 {
+    _preventResign = NO;
     _mouseDownEvent = nil;
 }
 
 - (void)mouseDownOnToken:(_CPTokenFieldToken)aToken withEvent:(CPEvent)anEvent
 {
+    _preventResign = YES;
     _mouseDownEvent = anEvent;
 }
 
@@ -420,11 +428,10 @@ var CPThemeStateAutoCompleting          = @"CPThemeStateAutoCompleting",
     {
         [self _selectToken:aToken byExtendingSelection:[anEvent modifierFlags] & CPShiftKeyMask];
         [[self window] makeFirstResponder:self];
-        // When a token is clicked on and the editor was active, it blurs and causes the field to
-        // resign first responder. The line above restores first responder status in that case,
-        // but the scroll position will be lost. So scroll to the just clicked token.
+        // Snap to the token if it's only half visible due to mouse wheel scrolling.
         _shouldScrollTo = aToken;
     }
+    _preventResign = NO;
 }
 
 // ===========
@@ -565,6 +572,9 @@ var CPThemeStateAutoCompleting          = @"CPThemeStateAutoCompleting",
             if (CPTokenFieldInputOwner && [CPTokenFieldInputOwner._tokenScrollView documentView]._DOMElement != CPTokenFieldDOMInputElement.parentNode)
                 return;
 
+            if (CPTokenFieldInputOwner && CPTokenFieldInputOwner._preventResign)
+                return false;
+
             if (!CPTokenFieldInputResigning && !CPTokenFieldFocusInput)
             {
                 [[CPTokenFieldInputOwner window] makeFirstResponder:nil];