QWebEngineView dock in floating dock area, hides other docked window.

[ma-robox]

simple.zip

Hello,

we have found a strange bug with QWebEngineView, the attached code is made from the starting simple example, we added a few docking windows and the webengine requirements.

The procedure to trigger the bug is scripted in the mainwindow.cpp with QTimer but can be manually executed:

1. undock a docked window in a new floating dock area (any but the webengineview)
2. undock and dock the webengineview window on the first floating dock area
3. now the first dockwindow has been hidden
4. undock and dock another window in the floating dock area
5. all three windows should be visible in the tabwidgetbar

[ma-robox]

I investigated and possibly fixed this in commit:

ma-robox@8399016

Root cause:
CFloatingDockContainer::hideEvent() could propagate toggleView(false) on non-spontaneous hide/show cycles triggered after tabifying a QWebEngineView, which could close unrelated tabs.

Fix:
hide propagation to child dock widgets is now gated to the explicit close path only.

Result:
the floating dock area keeps all tabs (including non-WebEngine tabs) visible/open; WebEngine tab activation no longer makes other tabs disappear.