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gitk: Fix bug where current row number display stops working
The display of the current row number would stop working if the user clicked on a line, or if selectedline got unset for any other reason, because the trace on it got lost when it was unselected. This fixes it by changing the places that unset selectedline to set it to the empty string instead, and the places that tested for it being set or unset to compare it with the empty string. Thus it never gets unset now. This actually simplified the code in a few places since it can be compared for equality with a row number now without first testing if it is set. Signed-off-by: Paul Mackerras <paulus@samba.org>
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Paul Mackerras
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May 20, 2008
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