gitk: Fix transient windows on Win32 and MacOS
Transient windows cause problems on these platforms: - On Win32 the windows appear in the top left corner of the screen. In order to fix it, this patch causes them to be explicitly centered on their parents by an idle handler. - On MacOS with Tk 8.4 they appear without a title bar. Since it is clearly unacceptable, this patch disables transient on that platform. Signed-off-by: NAlexander Gavrilov <angavrilov@gmail.com> Signed-off-by: NPaul Mackerras <paulus@samba.org>
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