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Backport PR#17261: avoid calling wx.Bitmap() if width or height is zero

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Lines changed: 3 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -776,14 +776,14 @@ def _onSize(self, evt):`
`776`	`776`	`# no change in size`
`777`	`777`	`return`
`778`	`778`	`self._width,self._height=size`
`779`		`-# Create a new, correctly sized bitmap`
`780`		`-self.bitmap=wx.Bitmap(self._width,self._height)`
`781`		`-`
`782`	`779`	`self._isDrawn=False`
`783`	`780`
`784`	`781`	`ifself._width<=1orself._height<=1:`
`785`	`782`	`return# Empty figure`
`786`	`783`
	`784`	`+# Create a new, correctly sized bitmap`
	`785`	`+self.bitmap=wx.Bitmap(self._width,self._height)`
	`786`	`+`
`787`	`787`	`dpival=self.figure.dpi`
`788`	`788`	`winch=self._width/dpival`
`789`	`789`	`hinch=self._height/dpival`

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