Blame: Start on line also when control already exists #9832
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This is the core change in #9805
To add tests to this, a lot more has to be changed and this change is useful to functional testing other upcoming GoToLine changes,
so it was broken out to a separate PR.
#9805 is kept to handle the tests.
Proposed changes
Blame can start presenting on a line. This is is available in
RevDiff and RevFileTree since #9424.
(Even if the code enabling this has existed for long time,
it was just used for a special case.)
The "goto line" was only used if the control had to be init,
not if e.g. toggling to Diff and selecting an new diff line
and then Blame again.
Screenshots
See #9805
Test methodology
Manual - tests in #9805
Merge strategy
I agree that the maintainer squash merge this PR (if the commit message is clear).
✒️ I contribute this code under The Developer Certificate of Origin.