[Libreoffice-bugs] [Bug 140207] New: Qt's ImCursorRectangle is not correctly take device scale factor into account

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=140207

            Bug ID: 140207
           Summary: Qt's ImCursorRectangle is not correctly take device
                    scale factor into account
           Product: LibreOffice
           Version: 7.1.0.3 release
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: UI
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: wengxt at gmail.com

For regular Qt application, the ImCursorRectangle value returned by
inputMethodQuery is scaled with the corresponding QWindow's device scale
factor.

But libreoffice returns the non-scaled value which confuses the input method
and send the non-native coordinates.

To be more concrete, this is how the coordinates being transformed by fcitx:
(fcitx is expected to receive the native pixel value from application)

https://github.com/fcitx/fcitx5-qt/blob/cb48a057e1bcb0961a9eaaf12dda73f164b98b0c/qt5/platforminputcontext/qfcitxplatforminputcontext.cpp#L413

As you can see, the coordinates is up-scaled based on the input window's device
pixel ratio then sent to input method server. But libreoffice set the non-scale
value here, which makes it scaled wrongly in this code.

In this case, Libreoffice need to be fixed to behave consistently with other Qt
application on this value (dividing the value by window scale).

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