Every time text is apparently pasted from Chromium (and possibly other applications, though I am not certain of this) a dialog box pops up asking me to "Select the language to be used for import". I don't even know what effect this has—presumably it is for spell-checking, which is unnecessary for my purpose. I have not been able to find any way to disable this, or set a default action.
*** This bug has been marked as a duplicate of bug 65872 ***