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Prevent FigureCanvasQT_draw_idle recursively calling itself. #16028

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Dec 29, 2019
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7 changes: 3 additions & 4 deletions lib/matplotlib/backends/backend_qt5.py
Original file line number Diff line number Diff line change
Expand Up @@ -481,17 +481,16 @@ def draw_idle(self):
QtCore.QTimer.singleShot(0, self._draw_idle)

def _draw_idle(self):
if self.height() < 0 or self.width() < 0:
self._draw_pending = False
if not self._draw_pending:
return
self._draw_pending = False
if self.height() < 0 or self.width() < 0:
return
try:
self.draw()
except Exception:
# Uncaught exceptions are fatal for PyQt5, so catch them instead.
traceback.print_exc()
finally:
self._draw_pending = False

def drawRectangle(self, rect):
# Draw the zoom rectangle to the QPainter. _draw_rect_callback needs
Expand Down