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extdiff: don't run gui programs when in a cli-only environment...
extdiff: don't run gui programs when in a cli-only environment In order to provide a useful error message to override the behavior, we also need to slightly change the way that tool.gui is found in the config. Before, it had to be where tool.diffargs is located, which might not exist. Now, tool.isgui can exist on its own. A test is added for the new error message. We also need to force procutil.isgui() to return true, so we set $DISPLAY to a non-empty value before running any test expecting to have a gui.
Martin von Zweigbergk - - Load All Authors

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5.2
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== New Features ==
* The amend extension supports the `--currentuser` argument.
* The amend extension supports the `--close-branch` argument.
* The amend extension supports the `--secret` argument.
* The uncommit extension supports the `rewrite.update-timestamp` config option.
== New Experimental Features ==
== Bug Fixes ==
== Backwards Compatibility Changes ==
* A shell that supports `$(command)`` syntax for command substitution is now
required for running the test suite. The test runner normally uses
`sh`, so if that is a shell that doesn't support `$(command)` syntax,
you can override it by setting `$HGTEST_SHELL` or by passing it to
`run-tests.py --shell <shell>`.
* The (experimental) narrow extension's wire protocol changed. If
you're using it, you'll need to make sure to upgrade server and
client at the same time.
== Internal API Changes ==