Avoid auto-scaling artefacts in Safari on retina displays

(resulting in “traces” when dragging items)

1 files changed, 4 insertions, 2 deletions

diff --git a/morphic.js b/morphic.js
index a001c6f..9616897 100644
--- a/morphic.js
+++ b/morphic.js
@@ -1041,7 +1041,7 @@
 /*global window, HTMLCanvasElement, getMinimumFontHeight, FileReader, Audio,
 FileList, getBlurredShadowSupport*/
 
-var morphicVersion = '2014-December-03';
+var morphicVersion = '2014-December-05';
 var modules = {}; // keep track of additional loaded modules
 var useBlurredShadows = getBlurredShadowSupport(); // check for Chrome-bug
 
@@ -1931,7 +1931,9 @@ Rectangle.prototype.round = function () {
 
 Rectangle.prototype.spread = function () {
     // round me by applying floor() to my origin and ceil() to my corner
-    return this.origin.floor().corner(this.corner.ceil());
+    // expand by 1 to be on the safe side, this eliminates rounding
+    // artefacts caused by Safari's auto-scaling on retina displays
+    return this.origin.floor().corner(this.corner.ceil()).expandBy(1);
 };
 
 Rectangle.prototype.amountToTranslateWithin = function (aRect) {