[Guy Harris <gharris@xxxxxxxxxxxx>]

> ...or to, when the "Find Frame" dialog is dismissed, forcibly close any
> filter dialog boxes opened from that dialog.

Done.  (I also caught some other cases where you could potentially blow
up if you deleted a window with a "Filter:" button and a filter dialog
popped up as a result of pressing that button, and later selected a
filter from the filter dialog.  As a side-effect of my discarded first
attempt at that fix, I also fixed several dialog boxes, namely:

	Edit:Find Frame

	File:Open

	Capture:Start

so that if there's already a dialog box open for them and you select the
menu item again, the existing dialog box is reactivated rather than a
new one being opened, and I cleaned up some other miscellany, e.g. if
you quit Ethereal when there were "Follow TCP Stream" windows open, the
temporary files for them didn't get deleted.)