dispatch: adjust ui.flush() timing to stabilize test-blackbox.t
Without this change, dispatch.dispatch() could return before flushing all
stdio data. This means chg stdio would print data after receiving the result
code.
--- tests/test-blackbox.t
+++ tests/test-blackbox.t.err
@@ -354,13 +354,13 @@
> EOF
$ hg log --debug
removing $TESTTMP/gone/.hg
- warning: cannot write to blackbox.log: $ENOENT$ (no-windows !)
warning: cannot write to blackbox.log: $TESTTMP/gone/.hg/blackbox.log: $ENOTDIR$ (windows !)
$ cd ..
blackbox should disable itself if track is empty
$ hg --config blackbox.track= init nothing_tracked
+ warning: cannot write to blackbox.log: $ENOENT$
$ cd nothing_tracked
$ cat >> .hg/hgrc << EOF
> [blackbox]
<Include>
<!-- These are component GUIDs used for Mercurial installers.
YOU MUST CHANGE ALL GUIDs below when copying this file
and replace 'Mercurial' in this notice with the name of
your project. Component GUIDs have global namespace! -->
<!-- mercurial.wxs -->
<?define ProductUpgradeCode = {A1CC6134-E945-4399-BE36-EB0017FDF7CF} ?>
<?define ComponentMainExecutableGUID = {D102B8FA-059B-4ACC-9FA3-8C78C3B58EEF} ?>
<?define ProgramMenuDir.guid = {D5A63320-1238-489B-B68B-CF053E9577CA} ?>
</Include>