progress: add a changedelay to prevent parallel topics from flapping (
issue2698)
When combined with the earlier change to make the progress object
truly a singleton, this prevents the progress bar swapping on 'hg
clone --pull' on a local filesystem.
Thanks to timeless for lots of debugging help at the Copenhagen sprint
to isolate the root cause of this and a first draft an idea that would
fix it.
When Mercurial accepts more than one revision, they may be specified
individually, or provided as a topologically continuous range,
separated by the ":" character.
The syntax of range notation is [BEGIN]:[END], where BEGIN and END are
revision identifiers. Both BEGIN and END are optional. If BEGIN is not
specified, it defaults to revision number 0. If END is not specified,
it defaults to the tip. The range ":" thus means "all revisions".
If BEGIN is greater than END, revisions are treated in reverse order.
A range acts as a closed interval. This means that a range of 3:5
gives 3, 4 and 5. Similarly, a range of 9:6 gives 9, 8, 7, and 6.