FIX: always eraseRect in Qt widget #13050
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Re-focusing the figure window will call the draw method. If the facecolor of the figure and axes are transparent and we do not erase the widget we are effectively compositing the figure on to its self which results in artifacts anywhere there is alpha or anti-aliasing. Closes matplotlib#13012
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anntzer
approved these changes
Dec 29, 2018
timhoffm
approved these changes
Dec 30, 2018
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Re-focusing the figure window will call the draw method. If the
facecolor of the figure and axes are transparent and we do not
erase the widget we are effectively compositing the figure on to its
self which results in artifacts anywhere there is alpha or
anti-aliasing.
Closes #13012