* Flush mode to settings ASAP when an unrelated option updates the mode.
Fixes, among other things, *enabling* the progress bar while the status
bar is hidden: this showed it, but kept mode as "off".
* Don't stomp on the current mode when toggling the progress bar.
And *always* pop the status bar back up to see the difference, even if
it's hidden.
This used to be done only when *enabling* the progress bar.
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