23effa79f7697cd27f04cb6edc9680e11e15f02a

Apparently a "feature" of Tcl/Tk on Mac OS X is that a disabled text widget cannot receive focus or receive a selection within it. This makes the diff viewer almost useless on that platform as you cannot select individual parts of the buffer. Now we force focus into the diff viewer when its clicked on with button 1. This works around the feature and allows selection to work within the viewer just like it does on other less sane systems, like Microsoft Windows. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
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