[Bug 141578] Libreoffice unusable with different scale factors used for different screens in multimonitor setup (on kf5/qt5/qt6 vcl + wayland)

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=141578

--- Comment #101 from Alex Tomé <tecnoter...@gmail.com> ---
Additional test result:

After modifying the LibreOffice launcher to start with:

```bash
SAL_USE_VCLPLUGIN=gtk3 libreoffice
```

LibreOffice starts using:

```
VCL: gtk3
```

With the GTK3 VCL backend, the multi-monitor scaling behaviour improves
significantly. The UI size remains much more consistent when moving the
LibreOffice window between the BenQ PD2700Q and LG 27MP400-B displays.

The default KF6 backend:

```
VCL: kf6 (cairo+wayland)
```

still shows the scaling issue under the same KDE Plasma 6.7.2 Wayland session.

This further suggests that the problem is related to the KF6/Qt6 Wayland VCL
backend rather than KDE display scaling configuration itself.

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