Revert "Set axis background to transparent in inlinebackend"...
Revert "Set axis background to transparent in inlinebackend"
This reverts commit 902c754fcbd0581ea33912e583cd3ccb8bdb9a5b.
Making axis transparent seem to confuse and annoy lot of people,
See
#7964 (do not fix it, this will be a 4.0 or 5.0 thing),
the real fix would be to use matplotlib themes.