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Update backend_nbagg for removal of Gcf._activeQue. #15901

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Merged
merged 1 commit into from
Dec 17, 2019
Merged

Update backend_nbagg for removal of Gcf._activeQue. #15901

merged 1 commit into from
Dec 17, 2019
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anntzer
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@anntzer anntzer commented Dec 10, 2019

Looks like nbagg was (ab)using _activeQue to have "pyplot-managed
figures that can never be gcf()" (not really sure why? this was here
ever since nbagg was first merged in #3008). Now that _activeQue has been
merged into figs this is no longer possible, but I guess the patch is
the closest in semantics?

Sorry I missed that in #13581. If that's too much of a problem we can revert #13581, but intentionally making Gcf.figs and Gcf._activeQue go out of sync is... a bit too clever?

PR Summary

PR Checklist

  • Has Pytest style unit tests
  • Code is Flake 8 compliant
  • New features are documented, with examples if plot related
  • Documentation is sphinx and numpydoc compliant
  • Added an entry to doc/users/next_whats_new/ if major new feature (follow instructions in README.rst there)
  • Documented in doc/api/api_changes.rst if API changed in a backward-incompatible way

@anntzer anntzer added the Release critical For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions. label Dec 10, 2019
@anntzer anntzer added this to the v3.2.0 milestone Dec 10, 2019
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What is _activeQue after all? I do not find that anywhere else in the code. That would be sort of ok, because the PR removes all it's usages in backend_nbagg.py. However the PR message and the comment in l.262ff seems to indicate that it's still a valid attribute. Am I missing something?

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anntzer commented Dec 15, 2019

Before #13581 there was both Gcf.figs and Gcf._activeQue. figs was a mapping of manager numbers to manager instances, and _activeQue a list of managers such that the active manager was the one at the end. I thought that they were always updated together and thus could just combine them together (making figs an OrderedDict), but I missed the fact that nbagg is the sole place which removes something from activeQue (making it nonactivable) without removing it from figs.

timhoffm
timhoffm reviewed Dec 16, 2019
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Comment in line 262ff should be updated. There is no activeQue anymore.

@anntzer
Update backend_nbagg for removal of Gcf._activeQue.
2692cf8 
Looks like nbagg was (ab)using _activeQue to have "pyplot-managed
figures that can never be gcf()" (not really sure why? this was here
ever since nbagg was first merged in).  Now that _activeQue has been
merged into figs this is no longer possible, but I *guess* the patch is
the closest in semantics?
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anntzer commented Dec 16, 2019

done

timhoffm
timhoffm approved these changes Dec 16, 2019
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Anybody can merge after CI pass.

@anntzer anntzer merged commit bf584bd into matplotlib:master Dec 17, 2019
@anntzer anntzer deleted the nbactive branch December 17, 2019 09:36
meeseeksmachine pushed a commit to meeseeksmachine/matplotlib that referenced this pull request Dec 17, 2019
@anntzer
Backport PR matplotlib#15901: Update backend_nbagg for removal of Gcf…
0965958 
…._activeQue.
@meeseeksmachine meeseeksmachine mentioned this pull request Dec 17, 2019
Merged
timhoffm added a commit that referenced this pull request Dec 17, 2019
@timhoffm
Merge pull request #15956 from meeseeksmachine/auto-backport-of-pr-15…
f725924 
…901-on-v3.2.x

Backport PR #15901 on branch v3.2.x (Update backend_nbagg for removal of Gcf._activeQue.)
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@tacaswell tacaswell tacaswell approved these changes

@timhoffm timhoffm timhoffm approved these changes

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