#wayland on 2023-12-21 — irc logs at oftc.irclog.whitequark.org

2023-04-28 11:16 ChanServ changed the topic of #wayland to: https://wayland.freedesktop.org | Discussion about the Wayland protocol and its implementations, plus libinput

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08:48 <Dami_Lu> Hi, When you have two windows stacked on top of each other in the same process, and you set one window to be the parent of the other (xdg_toplevel.set_parent), the child window will always appear on top when you switch focus to the parent window (in X11, the parent window will appear on top when you switch focus to the parent window). Is this a design feature of Wayland or a bug?

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08:53 <Dami_Lu> Can anyone please help explain this problem

09:17 <vyivel> Dami_Lu: that's the intended behavior

09:18 <Dami_Lu> But for client programs, there will be problems with inconsistent phenomena under x11 and wayland.

09:20 <emersion> it's up to the client to not indicate the parent-child relationship if there is no such relationship?

09:22 <Dami_Lu> This problem will only occur if the parent-child relationship is set, and it will not occur if it is not set.

09:22 <emersion> that's what the parent-child relationship means yes

09:24 <Dami_Lu> The same setting can switch the focus in x11 and let the child window display under the parent window.

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09:37 <MrCooper> I suspect there's actually no parent-child relationship with X, that's why it works there

09:38 <MrCooper> or it could be an X window manager issue

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09:45 <Dami_Lu> The parent-child relationship between the child window and the parent window is specially set.

09:45 <Dami_Lu> Of course, it is not ruled out that it is a problem under X, but after using X for a long time, many users do not think that this is a problem under X.

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10:00 <MrCooper> Dami_Lu: X child windows are always visible on top of their parent, so it can't be that at least; would have to be some kind of window manager protocol like NETWM instead, in which case the WM is a factor

10:04 <Dami_Lu> I used Qt demo and tested it with Kwin, Mutter, and Weston in x and wayland, and the effects were consistent.

10:05 <Dami_Lu> The child window is created when the button is pressed：

10:05 <Dami_Lu> connect(ui->pushButton, &QPushButton::clicked, this, [this] {

10:05 <Dami_Lu> QMainWindow *w =new QMainWindow(this);

10:05 <Dami_Lu> });

10:05 <Dami_Lu> w->show();

10:08 <davidre> Dami_Lu If the QWindow has a parent QtWayland creates a subsurface for it. If it has a transientParent it will be a xdg_toplevel with a parent set

10:11 <Dami_Lu> davidre: Yes, I am also analyzing the logic you mentioned in Qtwayland and kwin.

10:11 <Dami_Lu> xdg_toplevel.set_parent

10:11 <davidre> I am not sure which of both happens of you do a QMainWindow like this

10:13 <Dami_Lu> This is just an example. In fact, it’s not just QMainWindow, it’s the same for other sub-windows.

10:20 <davidre> Dami_Lu: I can't reproduce your issue

10:20 <davidre> I can switch focus to the parent window

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