Might have something to do with how the latest macdeployqt is generating the plist file. I did see some mentions that certain entries in the plist could trigger the behavior. Otherwise ... this tabbing thing seems like it's been around since MacOS 10.12 and there's been tab bar insertion complaints in Qt apps as early as Qt5.6. If that's the case, we should have been seeing this sooner. Perhaps see how the plist generation of the latest macdeployqt differs from the version used in our earlier Sigil releases? Maybe we'll get lucky and find there's something we can regex out of the plist.
But those code snippets sound like a sure-fire, long-term deterrent.
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