Move a detached window gives a jump

[PlasmaMichael]

Move a detached window gives a jump on the window position. At the end of the move the window doesn't stay at the position where you released the click.

[githubuser0xFFFF]

Which operating system do you use? Linux?

[PlasmaMichael]

Windows, I didn't try on another OS.

[githubuser0xFFFF]

Which Qt version do you use. I tested this with different Qt versions (5.9 - 5.12) on different Windows versions (7, 8, 10) and did not noticed any window jumping problem.

[PlasmaMichael]

Windows 10 and Qt 5.13.0.

[githubuser0xFFFF]

Fantastic. So oviously Qt 5.13.0 introduced some new strange "bug". I will test it with Qt 5.13 to see how to fix this.

[PlasmaMichael]

Just tried now Qt 5.13.1 which got released yesterday and I have the same result.

[githubuser0xFFFF]

Hi, I just tested the AdvancedDockingSystemDemo.exe app with Qt 5.13.1 and could not reproduce the problem. Could you please give some instructions what I need to do to see the "jump"? Maybe you could provide a video where I can se the "jump" so that I can get an idea what is going on.

[PlasmaMichael]

I compiled the example and I don't have the behavior I have when I tried your code in my project.
In my project, when I tried to use your code here what I concluded:

• I get a very laggy window movement when I undock and keep clicked to move the window
• I get jump when stop moving
• A crash when I try to undock again after dock one
• I saw that stylesheet is forced to be at one location, apps use already one stylesheet
• The minimize is not there which is a missing feature in my eyes

The last one we concluded that it's a design choice for this lib, the others are more critical to me.
Looks like the demo works well, so surely the lib needs more real use case in a full application to see all this kind of bugs.

The crash when I undock is in "moveFloating", the widget is not valid yet, surely an event issue.

[PlasmaMichael]

In addition to that I didn't find a way to resize or to force the dock to use the minimum width when it's added in the dock manager, that makes difficult to create a good default layout by code. You surely have a hint for that? Maybe it's a missing feature?

[PlasmaMichael]

About the crash when undock, if I undock and dock without mouse release the crash when undock is not present. It's only present when undock, mouse release, dock and finally try to undok again.

[githubuser0xFFFF]

Hi, I cannot reproduce this problem with the demo application. We use the docking system in a big real world appplication (pictures and video of the dark themed QmixElements application). This application also does not show these problems.

So I don't know how to fix this and I don't know what you are doing in your application - sorry.

[PlasmaMichael]

The original Docking system of Qt works perfectly so there must be something but yes difficult to say what is really happening. I tried to integrate this docking system in a full 3D engine editor which also contains a custom tabbed window like Chrome tab system, each tab contains one QMainWindow and the QMainWindow is full of dock windows. I will certainly bypass the use of this system because of the multiple things I mentioned but I have to say that this is still a great job.