Dropdown terminal on wayland always on the same monitor

[stefonarch]

We could use layershell->setScreenConfiguration(LayerShellQt::Window::ScreenConfiguration::ScreenFromCompositor); to open it where the cursor is, the downside is that it takes a screen resolution/size from one monitor and applies always that.

Possible Solution

A menu entry similar to lxqt-runner: On wayland open on monitor: active, 1, 2, ?

Steps to Reproduce (for bugs)

1. Use dropdown terminal on wayland with a dual head setup with different resolutions.
2. Move cursor between monitors and press shortcut

System Information

• QTerminal version: git

[tsujan]

the downside is that it takes a screen resolution/size from one monitor and applies always that.

Actually, there's an effective workaround for that.

The deeper problem arises when the second (third,...) monitor is scaled. Then the window will keep its pixel ratio (= scale factor) inside it, and that will ruin everything. This can be seen in lxqt-runner (and other Qt apps) too, although it's tolerable there because lxqt-runner usually has a small window.

All in all, a correct size for the drop-down window isn't guaranteed with multi-screen setups in general.

[tsujan]

A more accurate explanation:

The enum ScreenFromCompositor opens the window on the screen with the cursor. So far, so good. However, with the avialable Qt methods. we can know the focused screen (containing the cursor) only after the window is shown, and even then, the reported screen will be wrong if the top left corner of the window is on another screen. Therefore, there's no reliable way of showing the dropdown window with a correct size on the focused screen.

I experimented with several workarounds (e.g., a tiny, transparent, dummy widget), but all of them had bad side effects, to say nothing of their complexity.

[tsujan]

For reference: https://bugs.kde.org/show_bug.cgi?id=482733, https://bugs.kde.org/show_bug.cgi?id=485069, https://bugs.kde.org/show_bug.cgi?id=488780, and probably more.

[tsujan]

A simple idea is implemented in #1196: If this is impossible by resizing the window, then set the anchors and margins instead, and let the Wayland compositor do the resizing job according to them.