gitk: Fix bug causing Tcl error when changing find match type
When changing the selector for Exact/IgnCase/Regexp, we were getting
a Tcl error. This fixes it.
It also adds a workaround for a bug in alpha versions of Tk8.5 where
wordprocessor-style tabs don't seem to work properly around column 1.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
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