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fix resizeEvent in FigureCanvasQTAgg #17612

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fix resizeEvent in FigureCanvasQTAgg #17612

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8 changes: 6 additions & 2 deletions lib/matplotlib/backends/backend_qt5.py
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Original file line number Diff line number Diff line change
Expand Up @@ -364,8 +364,12 @@ def resizeEvent(self, event):
# the rendered buffer is useless before anyways.
if self._dpi_ratio_prev is None:
return
w = event.size().width() * self._dpi_ratio
h = event.size().height() * self._dpi_ratio
width = event.size().width()
height = event.size().height()
if width <= 0 or height <= 0:
return
w = width * self._dpi_ratio
h = height * self._dpi_ratio
dpival = self.figure.dpi
winch = w / dpival
hinch = h / dpival
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