Merge pull request matplotlib#30506 from meeseeksmachine/auto-backport-of-pr-30490-on-v3.10.x

Backport PR matplotlib#30490 on branch v3.10.x (Fix SVG rendering error in def update_background)

Author: timhoffm

lib/matplotlib/widgets.py

@@ -2157,6 +2157,8 @@ def update_background(self, event):
         # `release` can call a draw event even when `ignore` is True.
         if not self.useblit:
             return
+        if self.canvas.is_saving():
+            return  # saving does not use blitting
         # Make sure that widget artists don't get accidentally included in the
         # background, by re-rendering the background if needed (and then
         # re-re-rendering the canvas with the visible widget artists).