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The rescan function receives a callback command as its parameter, which is supposed to be executed after the scan finishes. It is generally used to update status. However, rescan may initiate a loading of a diff, which always calls ui_ready after completion. If the after handler is called before that, ui_ready will override the new status. This commit ensures that the after callback is properly threaded through the diff machinery. Since it uncovered the fact that force_first_diff actually didn't work due to an undeclared global variable, and the desired effects appeared only because of the race condition between the diff system and the rescan callback, I also reimplement this function to make it behave as originally intended. Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>