IME support (ibus, fcitx5) on Wayland

[o-alquimista]

I'm having trouble getting fcitx5 working on VSCodium. I see that this is an upstream problem, but I'm looking for workarounds.

This closed issue suggests some command-line options (--ozone-platform-hint=auto --enable-wayland-ime), but they didn't help.

I got VSCodium 1.96.2 from Flathub (flatpak), and it's running as a Wayland application on Sway WM — xeyes can't see it. Can it be run on XWayland instead? That would make IMEs work, I think.

com.vscodium.codium -h doesn't show any relevant documentation.

Details

$ com.vscodium.codium --help
codium-wrapper: Setting up NPM packages
codium-wrapper: Setting up Cargo packages
codium-wrapper: Setting up Python packages
codium-wrapper: Setting up Ruby packages
[2 zypak-helper] Wait found events, but sd-event found none
Warning: 'enable-wayland-ime' is not in the list of known options, but still passed to Electron/Chromium.
Warning: 'enable-features' is not in the list of known options, but still passed to Electron/Chromium.
VSCodium 1.96.2

Usage: codium [options][paths...]

To read from stdin, append '-' (e.g. 'ps aux | grep code | codium -')

Options
  -d --diff <file> <file>                    Compare two files with each other.
  -m --merge <path1> <path2> <base> <result> Perform a three-way merge by providing paths for two modified versions of a file, the common origin of both modified versions and the output file to save merge
                                             results.
  -a --add <folder>                          Add folder(s) to the last active window.
  -g --goto <file:line[:character]>          Open a file at the path on the specified line and character position.
  -n --new-window                            Force to open a new window.
  -r --reuse-window                          Force to open a file or folder in an already opened window.
  -w --wait                                  Wait for the files to be closed before returning.
  --locale <locale>                          The locale to use (e.g. en-US or zh-TW).
  --user-data-dir <dir>                      Specifies the directory that user data is kept in. Can be used to open multiple distinct instances of Code.
  --profile <profileName>                    Opens the provided folder or workspace with the given profile and associates the profile with the workspace. If the profile does not exist, a new empty one is
                                             created.
  -h --help                                  Print usage.

Extensions Management
  --extensions-dir <dir>              Set the root path for extensions.
  --list-extensions                   List the installed extensions.
  --show-versions                     Show versions of installed extensions, when using --list-extensions.
  --category <category>               Filters installed extensions by provided category, when using --list-extensions.
  --install-extension <ext-id | path> Installs or updates an extension. The argument is either an extension id or a path to a VSIX. The identifier of an extension is '${publisher}.${name}'. Use '--force' argument
                                      to update to latest version. To install a specific version provide '@${version}'. For example: 'vscode.csharp@1.2.3'.
  --pre-release                       Installs the pre-release version of the extension, when using --install-extension
  --uninstall-extension <ext-id>      Uninstalls an extension.
  --update-extensions                 Update the installed extensions.
  --enable-proposed-api <ext-id>      Enables proposed API features for extensions. Can receive one or more extension IDs to enable individually.

Troubleshooting
  -v --version                    Print version.
  --verbose                       Print verbose output (implies --wait).
  --log <level>                   Log level to use. Default is 'info'. Allowed values are 'critical', 'error', 'warn', 'info', 'debug', 'trace', 'off'. You can also configure the log level of an extension by
                                  passing extension id and log level in the following format: '${publisher}.${name}:${logLevel}'. For example: 'vscode.csharp:trace'. Can receive one or more such entries.
  -s --status                     Print process usage and diagnostics information.
  --prof-startup                  Run CPU profiler during startup.
  --disable-extensions            Disable all installed extensions. This option is not persisted and is effective only when the command opens a new window.
  --disable-extension <ext-id>    Disable the provided extension. This option is not persisted and is effective only when the command opens a new window.
  --sync <on | off>               Turn sync on or off.
  --inspect-extensions <port>     Allow debugging and profiling of extensions. Check the developer tools for the connection URI.
  --inspect-brk-extensions <port> Allow debugging and profiling of extensions with the extension host being paused after start. Check the developer tools for the connection URI.
  --disable-lcd-text              Disable LCD font rendering.
  --disable-gpu                   Disable GPU hardware acceleration.
  --disable-chromium-sandbox      Use this option only when there is requirement to launch the application as sudo user on Linux or when running as an elevated user in an applocker environment on Windows.
  --telemetry                     Shows all telemetry events which VS code collects.

Subcommands
  tunnel       Make the current machine accessible from vscode.dev or other machines through a secure tunnel
  serve-web    Run a server that displays the editor UI in browsers.

Warning: 'enable-wayland-ime' is not in the list of known options

What does this mean?