This commit fixes a problem where extra data (exec bit changes) was
stopping patch validation.

This patch fixes a regression from commit 139b2dd0 which added
validation of bzr status lines, but unintentionally required a space
after the '*' which denotes an exec bit change.

In bzr 2.3+, shelved items cause the status listing to include an extra
line at the end indicating their presence. This patch adds some simple
regex-based validation of status lines to avoid including any spurious
items in our status results.

Patch from Per Ångström.

Change suggested by Rainer Suhm.

Jan Danielsson authored Sep 19, 2012 and Kai Willadsen committed Sep 19, 2012

The name ".fos" for the local checkout state database will be
deprecated, and ".fslckout" will be used instead. ".fos" is still
recognized for compatibility.

Patch from Gianni Trovisi.

When correct prev/next diff sensitivity setting was added to directory
and VC views in 1.5.2, the code just recalculated on every cursor
movement, leading to some slowness in large treeviews. This commit
adds some invalidation checks which should significantly improve
performance in common situations.

Existing behaviour when right-clicking on an unselected row was to not
select the row, but show a context menu for the other currently
selected rows, which is inconsistent with Nautilus, among others.

This patch changes our behaviour to be more consistent with other file
management tools, in both Meld's directory and VC comparison views.
Right clicking an unselected file now selects it, moves the cursor to
it, and opens the context menu. The existing right-click behaviour for
already-selected files should be preserved.

Piotr Piastucki authored Feb 02, 2012 and Kai Willadsen committed Feb 19, 2012

Slightly change inner loops to improve performance by about 10%

Our existing "Refresh" action piggy-backed on the reload code, using
a semantically-dubious empty list to indicate a lack of changes. One
upshot of this was that undo-related functionality like modified flags
were unintentionally cleared on refresh.

This patch breaks out minimal required refresh functionality into a
new method, and replaces the old set-empty-files idiom with a call to
this method.