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#3358 was a workaround for a CodeMirror (actually Chrome seems to be the one at fault) bug drawing scrollbars over text, when there isn't anything to scroll. The workaround was a compromise, always drawing the space for the scrollbars to prevent the overlay, but reducing the margin so it isn't quite so annoying in the ~99% of the time that there are no scrollbars. It turns out (#3397, #3399) that the margins are not reliable, so the margin adjustment could cause the very same problem.
closes #3391, #3397, #3399
For users who need to hide the scrollbars while zooming text while we wait for a CodeMirror release, you can add the following to your custom.css:
or just put CodeMirror master in your profile's static/components directory.