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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.
Augie Fackler - - Load All Authors

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r46405:84eb4c83 merge default
r52916:d1b54c15 default
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5.6
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== New Features ==
* `hg mv -A` can now be used with `--at-rev`. It behaves just like
`hg cp -A --at-rev`, i.e. it marks the destination as a copy of the
source whether or not the source still exists (but the source must
exist in the parent revision).
* New revset predicate `diffcontains(pattern)` for filtering revisions
in the same way as `hg grep --diff pattern`.
* The memory footprint per changeset and per file during pull/unbundle
operations has been significantly reduced.
== New Experimental Features ==
== Bug Fixes ==
== Backwards Compatibility Changes ==
== Internal API Changes ==
* `merge.update()` is now private (renamed to `_update()`). Hopefully
the higher-level functions available in the same module cover your
use cases.
* `phases.registernew` now takes a set of revisions instead of a list
of nodes. `phases.advanceboundary` takes an optional set of revisions
in addition to the list of nodes. The corresponeding members of the
`phasecache` class follow this change.
* The `addgroup` member of `revlog` classes no longer keeps a list of
all found nodes. It now returns True iff a node was found in the group.
An optional callback for duplicated nodes can be used by callers to keep
track of all nodes themselve.
* The `_chaininfocache` of `revlog` classes has been changed from a dict
to a LRU cache.