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macosx cursors break with images #20797

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QuLogic opened this issue Aug 5, 2021 · 5 comments
Open

macosx cursors break with images #20797

QuLogic opened this issue Aug 5, 2021 · 5 comments
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GUI/osx

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@QuLogic
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@QuLogic QuLogic commented Aug 5, 2021

@QuLogic, I just tested the macosx cursors a bit. It didn't have anything to do with this PR. Master is the same behavior as 3.4.2.

Somehow it has to do with the plotted mappable on the axes...

import matplotlib.pyplot as plt

fig, ax = plt.subplots()

ax.contourf([[0, 1], [2, 3]])  # cursor changes to the grab/zoom image
# ax.imshow([[0, 1], [2, 3]])  # cursor does not change

plt.show()

It works properly for contourf, but not for imshow/pcolormesh. The cursor works as expected for all mappables with qt5agg.

Originally posted by @greglucas in #20620 (comment)
@QuLogic QuLogic added the GUI/osx label Aug 5, 2021
@greglucas
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@greglucas greglucas commented Aug 5, 2021

This works on v3.2.2, but not 3.3.0 and later. I'm not able to build 3.2.2 locally, so can't do a bisect to figure it out exactly. A quick diff of the _macosx.m file between those versions didn't yield anything immediately obvious to me either... Hopefully that helps someone else narrow down the issue.

@QuLogic
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@QuLogic QuLogic commented Aug 6, 2021

Could it be related to the mouse tracking changes in #16992?

@dstansby
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@dstansby dstansby commented Aug 25, 2021

This bisects to 1857fca from #17092 by @anntzer

@anntzer
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@anntzer anntzer commented Aug 25, 2021

I guess trying to display a 2-line status message may make macosx unhappy? No other idea for now...

@dstansby
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@dstansby dstansby commented Aug 26, 2021

I guess trying to display a 2-line status message may make macosx unhappy? No other idea for now...

Yep, this seems to be correct. Removing the newline here fixes the issue:

matplotlib/lib/matplotlib/backend_bases.py

Line 3060 in b600026

s = s + '\n' + data_str

I'm not sure what that means for fixing this though - I guess there's a bug somewhere in the macosx backend that needs fixing.

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@QuLogic @anntzer @dstansby @greglucas