Instead of disabling when the prefs are set not to show tex previews,
the preview menu item should display a dialog asking if you want to
enable tex previews.
As it is now, there is no way to tell why the menu item is disabled, or what
it actually does if the previews are off, and the key shortcut just beeps. I
had to guess why it wasn't working.
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I thought you never used this feature! I just added an
alert sheet, following your suggestion; feel free to adjust
if it doesn't make sense to you.