editor: add a small changectx cache Reverts including a lot of files create many actions like: R bar (from trunk/bar:4343) For each of these files, an open_file() call is made and the parent mercurial revision is loaded to detect copies in issamefile(). This results in a big slowdown, easily reduced by caching the changectx.

syntax:glob
build
*.pyc
*.pyo
.DS_Store
*.swp
*~
.coverage
cover
*.py,cover
MANIFEST
dist
*.egg-info
hgsubversion/__version__.py
nbproject
.project
.pydevproject
.settings
*.orig
.noseids
tests/fixtures/temp