New: selectable textfield Select All (Cmd-A, Ctrl-A) support.

Like in Cocoa, a non-editable but selectable text can now be clicked and all text can be selected with the Edit > Select All option or the associated keyboard equivalent. Just like in Cocoa this works on selectable text labels as well (text fields without a bezel).

AppKit/_CPImageAndTextView.j

@@ -802,4 +802,9 @@ var _CPimageAndTextViewFrameSizeChangedFlag         = 1 << 0,
     [super setFrameSize:aSize];
 }
 
+- (void)setSelectedRange:(CPRange)aRange
+{
+    [[[self window] platformWindow] setSelectedRange:aRange inElement:_DOMTextElement];
+}
+
 @end