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Emit xlim_changed on shared axes. #26011

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Merged
merged 1 commit into from
Jul 28, 2023
Merged

Emit xlim_changed on shared axes. #26011

merged 1 commit into from
Jul 28, 2023

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anntzer
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@anntzer anntzer commented May 30, 2023

PR summary

Closes #15785 (see #15785 (comment)).

PR checklist

for other in self._get_shared_axes():
if other is not self.axes:
other._axis_map[name]._set_lim(
v0, v1, emit=False, auto=auto)
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could this just be solved with the one line change of:

# Emit callbacks on shared axes without recursing
other.callbacks.process(f"{name}lim_changed", other)

inside of this for loop/if condition

seems overdesigned to introduce undocumented sentinel behavior to get one line to run.

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Ah yes, that's much better.

Comment on lines +1235 to +1248
if emit:
other.callbacks.process(f"{name}lim_changed", other)
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Suggested change
if emit:
other.callbacks.process(f"{name}lim_changed", other)
other.callbacks.process(f"{name}lim_changed", other)

This if will never be false as it is guarded by the same if emit: on line 1228 (with no overwriting of the variable.

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True, but I think guarding the shared-axes syncing with if emit: is actually wrong (#26085), whereas the extra if emit: here is correct, so perhaps let's keep it there so that we don't forget to put it in when removing the outer check?

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I was wondering a bit about that behavior, but didn't take the time to actually test it...

Could it be as simple as dedenting the for loop (and keeping this if)?

That would:

  • call the code to actually update the shared axes, regardless of emit
  • make emit truly only tied to the callback behavior, which is what I would expect

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Dedenting the for loop will lead to infinite recursion, so that will need some kind of marker to block recursion (but it can't be done by overloading the semantics of emit as I proposed initially...).

@ksunden ksunden added this to the v3.8.0 milestone Jul 27, 2023
@QuLogic QuLogic closed this Jul 27, 2023
@QuLogic QuLogic reopened this Jul 27, 2023
@QuLogic QuLogic merged commit 0dc8c2f into matplotlib:main Jul 28, 2023
@anntzer anntzer deleted the xcs branch July 28, 2023 05:26
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xlim_changed not emitted on shared axis
4 participants