gitk: Prevent the text pane from becoming editable
When setting the "Patch/Tree" radio buttons to "Tree" and clicking on a file to display it, the text pane would accidentally become editable (because of the early return in getblobline). Signed-off-by: NStefan Haller <stefan@haller-berlin.de> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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