Snooped a bit more in Qt's online docs ....
In Sigil, a ContentTab inherits from QWidget and according to the docs, if we overload this QWidget routine and ignore the event (controllable by setting a variable) it will not be able to be dragged.
Quote:
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if this event is ignored, it will not receive any drag move events.
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Code:
void QWidget::dragEnterEvent(QDragEnterEvent * event);
So we could add a enableDrag() and disableDrag() routine to ContentTab.cpp and then overload this routine and enable individual tab drag and drop behaviour.
And then every time a new tab becomes the current tab, we enable it and disable all of the others, so that only a current tab will be draggable (at least in theory!).
So it should be doable.
KevinH