gitk: Fix compare-commits function when we have local changes
This fixes a bug in the compare-commits function added in commit 010509f2 ("gitk: Add a command to compare two strings of commits") where gitk would show an error dialog if the comparison of commits got to a fake commit (one showing local changes). It extends getpatchid to handle these fake commits by using [diffcmd] to get the git diff command variant to use, and also handles the situation where an error occurs. Now that we can have the fake commit IDs showing up, which are 00..00 and 00..01, the short ID is ambiguous. To make sure the links point to the right commit, this adds a new [appendshortlink] procedure which takes the full link destination, and uses that rather than appendwithlinks. Signed-off-by: NPaul Mackerras <paulus@samba.org>
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