Bug with Qt 5.9.9 when drag floating widget to be docked widget.

[yjf0602]

I have to try several times to drag floating widget to be docked widget.
Windows10 + Qt5.9.9 + QtCreator + both MinGW and MSVC

[githubuser0xFFFF]

Please test with Qt 5.12 - it should work. I will investigate why it does not work for Qt 5.9.9

[githubuser0xFFFF]

Hi, I just tested with Qt 5.9.9. There seems to be a bug in Qt 5.9.9 that prevents proper reception of event QEvent::NonClientAreaMouseButtonRelease if dragged widget is behind another widget when the mouse button is released.

So your only option is to upgrade to Qt to a newer version if you would like to use ADS.

[githubuser0xFFFF]

I just pushed a commit into master that should fix this issue. This fix completely drops usage of Qt non clieant area mouse events like QEvent::NonClientAreaMouseButtonRelease and switches to native eventhandling of WM_xxxxxxx messages (like WM_ENTERSIZEMOVE) . After this change, it should work now with Qt 5.9.9

[yjf0602]

I tried the new code. It works with Qt5.9.9.