Qt6 (Flatpak version and regular version): keyboard input doesn't work

[atarax42]

CudaText 1.218.0.2 under Linux Mint 22 Cinnamon, Flatpak installation

When opening a text file with CudaText, keyboard inputs are not detected, text cannot be edited or deleted. Navigating the menu with keyboard shortcuts (e.g. Alt+F) works.

[Alexey-T]

I know that Flatpak version can 'eat' key input. But DEB or XZ packages work ok for everybody, AFAIK.

Try DEB packages for Qt5 and Gtk2.

[atarax42]

That is true, deb works. I changed my report.

[JordanL2]

Can't reproduce, editing a file with the flatpak version works for me, keyboard input works. I'd need more info about the exact situation or environment.

[oleole39]

Can't reproduce, editing a file with the flatpak version works for me, keyboard input works. I'd need more info about the exact situation or environment.

I noticed the same issue on Linux Mint 21 Cinnamon with CudaText 1.218.2.0 installed via Flatpak 1.12.7.
CudaText and Flatpak versions may not actually matter as I have always noticed that issue (>1 year).

Exact situation is :

1. Run flatpak install cudatext,

2. It asks you to choose between QT or QT5 (EOL) packages - choose the first one.

3. It asks for various permissions - accept

4. Run CudaText

5. CudaText's window appears. But:
   A. CudaText console contains the following warning:

   NOTE: No Python 3 engine found. Python plugins don't work now. To fix this:
   * write "pylib__linux" to user.json. Read about "pylib" in "Options / Settings-default".
   * or use the menu item "Plugins / Python engine was not found; find it..."
   

   I have tried the following without noticing any change, even after restarting CudaText:

   • use application Flatseal to give permission to CudaText to access /usr/lib/ (in section Filesystem -> Other files)
   • save the following user.json (i confirm /usr/lib/x86_64-linux-gnu/libpython3.10.so.1.0 does exist on the system).

     {
     "pylib__linux" : "/usr/lib/x86_64-linux-gnu/libpython3.10.so.1.0",
     }
     

   • click Plugin -> "Python engine was not found; find it..." and paste /usr/lib/x86_64-linux-gnu/libpython3.10.so.1.0

   B. Inside CudaText's window it is almost as if you had no keyboard. Pressing most keys has not effect. A few have though:

   • if console is displayed, Tab changes focus from text input box to console input box and then to console history (then it remains stuck to the latter).
   • shortcuts like CTRL+C / CTRL+V are not working. However ALT+F, ALT+E, etc. successfully open the contextual menus. When a contextual menu is displayed, you can also use arrows to navigate (whereas arrows won't do anything in the text input box).

In comparison:

• GTK2 binary for the same CudaText version works great on the same system: no keyboard issue, and no Python warning (it finds Python 3.10.12).
• I assume GTK2 deb would work as well.
• QT5 binary fails to open with ./cudatext: error while loading shared libraries: libQt5Pas.so.1: cannot open shared object file: No such file or directory
• QT5 deb (which installs deps libqt5pas-dev & libqt5pas1) fails to open with /usr/bin/cudatext: symbol lookup error: /usr/bin/cudatext: undefined symbol: QGuiApplication_setFallbackSessionManagementEnabled.

Thanks for checking that issue and let us know if you need additional information.

[Alexey-T]

sorry for late reply...

QT5 binary fails to open with ./cudatext: error while loading shared libraries: libQt5Pas.so.1: cannot open shared object file: No such file or directory

it means that libQt5Pas is not installed.
https://wiki.freepascal.org/CudaText#Linux:_Qt5_and_Qt6_builds

QT5 deb (which installs deps libqt5pas-dev & libqt5pas1) fails to open with /usr/bin/cudatext: symbol lookup error: /usr/bin/cudatext: undefined symbol: QGuiApplication_setFallbackSessionManagementEnabled.

it means that libQt5Pas installed but too old version w/o that function support.
same wiki link - gives the URL to last version on GIthub.

[oleole39]

QT5 binary fails to open with ./cudatext: error while loading shared libraries: libQt5Pas.so.1: cannot open shared object file: No such file or directory

it means that libQt5Pas is not installed. https://wiki.freepascal.org/CudaText#Linux:_Qt5_and_Qt6_builds

QT5 deb (which installs deps libqt5pas-dev & libqt5pas1) fails to open with /usr/bin/cudatext: symbol lookup error: /usr/bin/cudatext: undefined symbol: QGuiApplication_setFallbackSessionManagementEnabled.

it means that libQt5Pas installed but too old version w/o that function support. same wiki link - gives the URL to last version on GIthub.

Thanks for your reply.
I installed libqt6pas6:amd64 6.2.10 (latest release from the link indicated in the wiki) and made a new test:

• Deb package (1.220.0.0 QT6) with all suggested dependencies: it opens without errors/warnings, but almost no keyboard control as described in 5.B. in my previous message.
• Tar.xz archive (1.220.0.0 QT6) : it opens without errors/warnings, but almost no keyboard control as described in in 5.B. in my previous message.
• Flatpak package (1.219.1.0 QT6): it opens but comes the Python-related warning described in 5.A. of my previous message, and almost no keyboard control as described in 5.B..

[Alexey-T]

I posted the 'complain' to the Lazarus forum about Qt6.