I agree it's an edge case that may not warrant a ton of work, but if the second instance of Sigil is merely being opened and then closed (without closing the F&R), what changes are being written to the ini that would cause the F&R widget to close when clicking the Find button (after a new xhtml tab opens) in the original instance? Are the F&R parameters themselves being altered by the second instance opening?
If F&R can be made to disappear by a new tab opening (not an image tab) this way, then I'm guessing a way could be found without involving a second instance of Sigil. If so, that would be a bug, no?
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