Fix for item not being ull width in non-integral collection views.

[cappuccino#164 state:resolved].

Reviewed by me.

AppKit/CPCollectionView.j

@@ -328,7 +328,7 @@
     // either proportioned out to the views (if their minSize != maxSize) or used as
     // margin
     var itemSize = CGSizeMakeCopy(_minItemSize);
-        
+
     _numberOfColumns = MAX(1.0, FLOOR(width / itemSize.width));
 
     if (_maxNumberOfColumns > 0)
@@ -340,6 +340,10 @@
     if (remaining > 0 && itemSize.width < _maxItemSize.width)
         itemSize.width = MIN(_maxItemSize.width, itemSize.width + FLOOR(remaining / _numberOfColumns));
 
+    // When we ONE column and a non-integral width, the FLOORing above can cause the item width to be smaller than the total width.
+    if (_maxNumberOfColumns == 1 && itemSize.width < _maxItemSize.width && itemSize.width < width)
+        itemSize.width = MIN(_maxItemSize.width, width);
+
     if (!CGSizeEqualToSize(_itemSize, itemSize))
     {
         _itemSize = itemSize;
@@ -515,6 +519,7 @@
         frame = [view frame];
 
     [view setFrameSize:_itemSize];
+    [view setAlphaValue:0.5];
 
     [self dragView:view
         at:[[_items[[_selectionIndexes firstIndex]] view] frame].origin