Add a utility method to alter combobox dropdown width.
Fixes issue 4295
Change-Id: I9a73ed4c94ece2383870ea19103c07dbf3543d42
Reviewed-on: http://gerrit.dmdirc.com/1414
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Chris Smith <chris@dmdirc.com>
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