https://bugs.kde.org/show_bug.cgi?id=528447
Bug ID: 528447
Summary: App window is placed on screen and only moves to the
memorized spot ~1–2 s later (hide re-maps on unhide,
minimize to taskbar: app stays mapped)
Classification: Plasma
Product: kwin
Version First 6.6.6
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
## STEPS TO REPRODUCE
1. Save the script below as `hide_show_test.py` and run it with `python3`
(needs `python3-pyqt6`).
It opens a window and logs to `/tmp/hide-show-test.log`.
2. Move the window anywhere on any screen.
3. Close it with the X button — it hides and re-opens 2 s later, four times.
4. Watch where it re-appears; compare the log with `org.kde.KWin /Scripting`
positions if wanted.
## OBSERVED RESULT
The re-opened window is first placed at a position it held earlier in the
session, and only then
moved to the position it was closed at:
```
22:05:52 closed at 457,200 (DP-1)
22:05:55 re-opened -> 2594,144 (eDP-1) <- first placement
22:05:56 -> 457,200 (DP-1) <- then the closed position
22:06:11 re-opened -> 1955,352 -> 2353,357 -> 1955,352 (same screen, ~400
px detour)
```
Qt's own `geometry()` never matches either position; it reports the top-left of
the output the
window lands on.
## EXPECTED RESULT
The window re-appears at the position it was closed at, without a first
placement elsewhere and
without a visible move.
## SOFTWARE/OS VERSIONS
```
Operating System: Ubuntu 26.04.1 LTS (kernel 7.0)
KDE Plasma Version: 6.6.6
KDE Frameworks Version: 6.24.0
Qt Version: 6.10.2 (KWin reports Qt 6.10.2, XCB 1.17.0)
Graphics Platform: Wayland
```
## ADDITIONAL INFORMATION
Minimal reproducer (only `python3-pyqt6` required; logs to
`/tmp/hide-show-test.log`):
```python
#!/usr/bin/python3
"""Reproducer: a window that hides on close and re-opens itself four times."""
import sys
import time
from PyQt6.QtCore import QSettings, QTimer
from PyQt6.QtWidgets import QApplication, QLabel, QMainWindow
MAX_CYCLES = 4
LOG_PATH = "/tmp/hide-show-test.log"
log = open(LOG_PATH, "w", buffering=1)
def note(text: str) -> None:
line = f"{time.strftime('%H:%M:%S')} {text}"
print(line, flush=True)
log.write(line + "\n")
class Window(QMainWindow):
def __init__(self) -> None:
super().__init__()
self._settings = QSettings("hide-show-test", "geometry")
self.setWindowTitle("hide/show test")
self.setCentralWidget(QLabel("move me, then close with X"))
geometry = self._settings.value("geometry")
if geometry is not None:
self.restoreGeometry(geometry)
else:
self.resize(700, 500)
def closeEvent(self, event) -> None:
# keep the process alive and the window out of the taskbar, as a tray
app does
self._settings.setValue("geometry", self.saveGeometry())
self.hide()
event.ignore()
app = QApplication(sys.argv[:1])
app.setApplicationName("hide-show-test")
app.setQuitOnLastWindowClosed(False)
window = Window()
state = {"cycles": 0, "visible": False, "finished": False}
def reopen() -> None:
window.show()
window.raise_()
window.activateWindow()
def tick() -> None:
if state["finished"]:
return
visible = window.isVisible()
if state["visible"] and not visible:
state["cycles"] += 1
note(f"closed #{state['cycles']}
qt_geometry={window.geometry().getRect()}")
if state["cycles"] >= MAX_CYCLES:
state["finished"] = True
note("done")
QTimer.singleShot(800, app.quit)
return
QTimer.singleShot(2000, reopen)
elif visible and not state["visible"]:
note(f"shown qt_geometry={window.geometry().getRect()}")
state["visible"] = visible
timer = QTimer()
timer.timeout.connect(tick)
timer.start(200)
note(f"log file: {LOG_PATH}")
reopen()
sys.exit(app.exec())
```
Notes:
- The same happens with the window merely hidden and shown again, without a
close event.
- It does **not** happen when the window stays mapped (minimised instead of
hidden), and it does not
happen with `QT_QPA_PLATFORM=xcb` (XWayland), where the window opens directly
at the restored
position.
- Not specific to one output or one driver: reproduced with two outputs (eDP-1,
DP-1) and with three
(eDP-1, DVI-I-1, DVI-I-2 over DisplayLink), and with the window moved only
within one screen.
- Remove the form's `***` boilerplate before submitting.
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