The unplug() and startDrag() functions of QMainWindowLayout and
QDockWidget used a boolean argument specifying whether a single dock
widget or a group of dock widgets should be unplugged. The argument
defaulted to true.
That has lead to inconsistent unplug operations, broken item_lists and
crashes, especially when the methods were called without an argument.
To improve code readability, replace bool trap with a meaningful
enum. Remove default arguments, in order to force explicit calls.
This patch does not change behavior, it is just carved out to
facilitate reviews.
Task-number: QTBUG-118578
Task-number: QTBUG-118579
Pick-to: 6.6 6.5
Change-Id: I50341b055f0bb76c2797b2fb1126a10de1fee7dd
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
c93ab8c2a0