Bug 494001

SUMMARY
I have three monitors connected. At night I turn them off. In the morning I turn them on. Often there are windows which are stuck offscreen and the usual tricks for moving them don't work (e.g. right click item on task manager > more > move; also kwin scripts fail to move windows). But when I repeatedly click the item in the task manager which would minimize/un-minimze the window, I can see the "Magic Lamp" effect swooping the window into the taskbar and out of the taskbar to somewhere offscreen to the upper right of my monitors.

I can't say whether this happens more to some windows or application types more than others. Some recent ones I can think of are windows in an electron app (obsidian, native wayland mode), and a jupyter qtconsole window (native wayland window).

One solution that would be nice is a way to turn off display port monitors without kwin actually disconnecting them. I never need kwin to automatically shuffle all my windows and panels and widgets all over the place just cause I want to turn off my screens. The display configuration could have a checkbox next to "Enabled" for "Frozen" or "Locked" to tell kwin to keep that monitor frozen in the current layout. For my permanent desktop setup, I would check off every one of those. I could previously achieve this effect by stopping the KScreen background service, but that stopped working (possibly with wayland), not to mention background services aren't shown in settings anymore.


STEPS TO REPRODUCE
0. Have a bunch of windows open
1. Turn off three monitors one at a time
2. Turn on three monitors one at a time
3. See if you can access each window
4. See if you can use "Move" function from task manager right click menu to move the window on-screen
5. See if you can use a kwin script to change the position of the window

OBSERVED RESULT
- Some windows cannot be accessed and are stuck offscreen.
- Can't use "move" function. 
- Kwin script cannot change stuck window position or geometry. See more details in bottom section.

EXPECTED RESULT
- Windows should always be in valid desktop area.
- "Move" function should always let you move a window from an invalid area to valid desktop area
- kwin script should always let you change window geometry, regardless if it is currently in an invalid area

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.7.2
Kernel Version: 6.6.52-1-lts (64-bit)
Graphics Platform: Wayland
Processors: 16 × Intel® Core™ i9-9900K CPU @ 3.60GHz
Memory: 62.6 GiB of RAM
Graphics Processor: AMD Radeon RX 6600

ADDITIONAL INFORMATION
https://bugs.kde.org/show_bug.cgi?id=452118 is related/closed and was suggested to open new bug reports


LIVE EXAMPLE

I have a window stuck offscreen right now.

My screens look like this:

    DP-6        2560,360,3840x2160
    DP-7        0,1440,2560x1440
    DP-5        0,0,2560x1440
> +-------------------+
> |                   |-----------------------------+
> |       DP-5        |                             |
> |                   |                             |
> |                   |                             |
> +-------------------+            DP-6             |
> |                   |                             |
> |       DP-7        |                             |
> |                   |                             |
> |                   |-----------------------------+
> +-------------------+

The window stuck offscreen is a Jupyter QtConsole (native wayland window). In the kwin debug console it says: bufferGeometry: 7362,28 958x1052
Since I can't screenshot that or copy the rest of the values, in `plasma-interactiveconsole --kwin` I'll dump the client info matching to it's pid

const clients = workspace.windowList();
for (var i = 0; i < clients.length; i++) {
    var client = clients[i]
    if (client.pid === 3082266) {
        // JSON.stringify(client)) // cant print circular references
        Object.keys(client).forEach(function(key) {
            var value = client[key];
            print(key, "=", value)
        })
    }
}


> objectName =
> bufferGeometry = QRectF(7362, 28, 958, 1052)
> clientGeometry = QRectF(7362, 28, 958, 1052)
> pos = QPointF(7360, 0)
> size = QSizeF(960, 1080)
> x = 7360
> y = 0
> width = 960
> height = 1080
> opacity = 1
> output = KWin::DrmOutput(0x5f7cf78a20b0)
> rect = QRectF(0, 0, 960, 1080)
> resourceName = python3.12
> resourceClass = python3
> windowRole =
> desktopWindow = false
> dock = false
> toolbar = false
> menu = false
> normalWindow = true
> dialog = false
> splash = false
> utility = false
> dropdownMenu = false
> popupMenu = false
> tooltip = false
> notification = false
> criticalNotification = false
> appletPopup = false
> onScreenDisplay = false
> comboBox = false
> dndIcon = false
> windowType = 0
> managed = true
> deleted = false
> skipsCloseAnimation = false
> popupWindow = false
> outline = false
> internalId = {5d33508e-1159-4eff-9b0b-752b71e517a9}
> pid = 3082266
> stackingOrder = 28
> fullScreen = false
> fullScreenable = true
> active = false
> desktops = [KWin::VirtualDesktop(0x5f7cf67061f0)]
> onAllDesktops = false
> activities = [b27b5dce-4d17-4310-91d7-31844c1b40d5]
> skipTaskbar = false
> skipPager = false
> skipSwitcher = false
> closeable = true
> icon = QVariant(QIcon, QIcon("wayland",availableSizes[normal,Off]=QList(QSize(16, 16), QSize(22, 22), QSize(32, 32), QSize(48, 48), QSize(64, 64), QSize(128, 128), QSize(256, 256)),cacheKey=0x400000000))
> keepAbove = false
> keepBelow = false
> shadeable = false
> shade = false
> minimizable = true
> minimized = false
> iconGeometry = QRectF(2292, 2033, 268, 36)
> specialWindow = false
> demandsAttention = false
> caption = Jupyter QtConsole
> minSize = QSizeF(150, 150)
> maxSize = QSizeF(2.14748e+09, 2.14748e+09)
> wantsInput = true
> transient = false
> transientFor = null
> modal = false
> frameGeometry = QRectF(7360, 0, 960, 1080)
> move = false
> resize = false
> decorationHasAlpha = true
> noBorder = false
> providesContextHelp = false
> maximizable = true
> moveable = true
> moveableAcrossScreens = true
> resizeable = true
> desktopFileName = python3
> hasApplicationMenu = false
> applicationMenuActive = false
> unresponsive = false
> colorScheme = kdeglobals
> layer = 2
> hidden = false
> tile = KWin::Tile(0x5f7d1c9e0250)
> inputMethod = false

Obviously x=7362 is way way way off screen. If I try to set geometry in a similar script, neither method works:

const clients = workspace.windowList();
for (var i = 0; i < clients.length; i++) {
    var client = clients[i]
    if (client.pid === 3082266) {
        //client.frameGeometry = {"x":1000,"y":1000} // doesn't work
        client.frameGeometry = {"x":1000,"y":1000, "width": 1000, "height": 1000, "left":1000, "right":2000, "top":1000, "bottom":2000} // also doesn't work
    }
}

Also occasionally I can get it back on screen by temporarily enabling/disabling a monitor, but that also isn't working in this case.