Issue moving .qml app between monitors using flags: Qt.Window | Qt.FramelessWindowHint. Is this a bug?

Amulex

Hey!

Hope this is the right place. I'm working with QDS but I believe this to be a QML/QT Quick issue. If you have any insight, please let me know!

Environment: I am developing on a Windows 11 device. I have 3 monitors with 3 different aspect ratios and DPI.

I have been working on a frameless window which works great until you try to move between monitors. There are three issues:

When moving between monitors, the window size gets smaller.
The screen flickers in different locations on the screen before moving over. It kind of spazzes out, not sure how to describe it.
Moving between monitors can cause the program to disappear requiring a force close. It's on the taskbar but not visible.

One method to avoid this is to repaint the window at the destination instead of having the drag and drop visual. This is a bad solution.

In my research, this appears to be an existing issue, though all posts are older.

https://github.com/stdware/qwindowkit/tree/main - a repo fixing this issue, though I work in python, not sure how I would implement this fix.

This is my pseudo-workaround. It works but getting the window where you want is non-intuitive.

import QtQuick
import QtQuick.Window

Window {
    id: window
    width: 1600
    height: 900
    minimumWidth: 1600
    maximumWidth: 1600
    minimumHeight: 900
    maximumHeight: 900
    visible: true
    flags: Qt.Window | Qt.FramelessWindowHint
    color: "#EAEAEA"

    MouseArea {
        anchors.fill: parent
        property point lastMousePos
        property point startWindowPos
        property bool isDragging: false

        onPressed: {
            isDragging = true
            lastMousePos = Qt.point(mouseX, mouseY)
            startWindowPos = Qt.point(window.x, window.y)
        }

        onReleased: {
            if (isDragging) {
                var delta = Qt.point(mouseX - lastMousePos.x, mouseY - lastMousePos.y)
                var finalX = startWindowPos.x + delta.x
                var finalY = startWindowPos.y + delta.y

                // Directly set the final position
                window.x = finalX
                window.y = finalY
                isDragging = false
            }
        }

        onPositionChanged: {
            if (isDragging) {
                // We could optionally show a preview or indicator of where the window will go
                // But we don't actually move the window until release
            }
        }
    }

    Text {
        anchors.centerIn: parent
        text: window.width + " x " + window.height + "\n" +
              "Screen: " + (window.screen ? window.screen.name : "none") + "\n" +
              "Position: " + Math.round(window.x) + ", " + Math.round(window.y)
        font.pixelSize: 24
        color: "black"
        horizontalAlignment: Text.AlignHCenter
    }
}

Any thoughts/insight would be greatly appreciated!