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Fix: Prevent Cursor blitting from erasing overlapping axes (#25670) #31368

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Merged
QuLogic merged 6 commits into from
Mar 30, 2026
+26 −0
Merged

Fix: Prevent Cursor blitting from erasing overlapping axes (#25670) #31368

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9faecaf
Fix: Prevent Cursor blitting from erasing overlapping axes
MohitPal2005 Mar 24, 2026
b39eaf1
Fix styling: remove trailing whitespace and shorten comment
MohitPal2005 Mar 24, 2026
d1f0a33
MAINT: explicitly mark Cursor blitting on overlapping axes as unsuppo…
MohitPal2005 Mar 29, 2026
1a29cbc
style: fix ruff line length limit in widgets.py
MohitPal2005 Mar 29, 2026
1098b05
test: add coverage for cursor overlapping axes warning
MohitPal2005 Mar 30, 2026
f2050ae
chore: trigger CI to clear Windows timeout flake
MohitPal2005 Mar 30, 2026
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15 changes: 14 additions & 1 deletion lib/matplotlib/widgets.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2084,6 +2084,18 @@ def __init__(self, ax, *, horizOn=True, vertOn=True, useblit=False,
self.vertOn = vertOn
self.useblit = useblit and self.canvas.supports_blit # TODO: make dynamic

# --- NEW CODE: Check for overlapping axes and fallback ---
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if self.useblit:
for ax_ in ax.get_figure(root=True).get_axes():
if ax_ is not ax and ax.bbox.overlaps(ax_.bbox):
_api.warn_external(
"Cursor blitting is currently not supported on "
"overlapping axes; falling back to useblit=False."
)
self.useblit = False
break
# ---------------------------------------------------------
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if self.useblit:
lineprops['animated'] = True
self.lineh = ax.axhline(ax.get_ybound()[0], visible=False, **lineprops)
Expand Down Expand Up @@ -2119,11 +2131,12 @@ def onmove(self, event):
self.lineh.set_visible(self.visible and self.horizOn)
if not (self.visible and (self.vertOn or self.horizOn)):
return
# Redraw.
# Redraw.
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if self.useblit:
background = self._load_blit_background()
if background is not None:
self.canvas.restore_region(background)

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self.ax.draw_artist(self.linev)
self.ax.draw_artist(self.lineh)
self.canvas.blit(self.ax.bbox)
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