misc/rio.desktop: add X-TerminalArg* keys for xdg-terminal-exec support

[alezunino]

Summary

misc/rio.desktop defines none of the X-TerminalArg* keys required by the xdg-terminal-exec specification. Per the spec ("Desktop entry for a terminal"), an entry eligible for selection must have the TerminalEmulator category AND the X-TerminalArgExec key (X- prefix while the specification is in proposed status), which holds the command-execution argument placed before the requested command. Without it,
xdg-terminal-exec cannot reliably select or invoke Rio (strict mode rejects the entry; compat mode falls back to a -e default).

Current content (misc/rio.desktop)

[Desktop Entry]
Type=Application
TryExec=rio
Exec=rio
Icon=rio
Terminal=false
Categories=System;TerminalEmulator;

Name=Rio
GenericName=Terminal
Comment=A hardware-accelerated GPU terminal emulator powered by WebGPU
StartupWMClass=Rio
Actions=New;

[Desktop Action New]
Name=New Terminal
Exec=rio

Check:

grep -c '^X-TerminalArg' /usr/share/applications/rio.desktop  # 0

Expected / proposed fix

Add the keys from the attached rio.desktop.fixed:

 Actions=New;
+X-TerminalArgExec=--command
+X-TerminalArgAppId=--app-id
+X-TerminalArgTitle=--title-placeholder
 
 [Desktop Action New]

Mapping to Rio CLI:

• X-TerminalArgExec=--command <-> -e, --command ... ("Command and args to execute (must be last argument)")
• X-TerminalArgAppId=--app-id
• X-TerminalArgTitle=--title-placeholder <-> --title-placeholder <TITLE> ("Start window with specified title")

The X- prefix is correct while the spec is in proposed status.

Resulting file (rio.desktop.fixed)

[Desktop Entry]
Type=Application
TryExec=rio
Exec=rio
Icon=rio
Terminal=false
Categories=System;TerminalEmulator;

Name=Rio
GenericName=Terminal
Comment=A hardware-accelerated GPU terminal emulator powered by WebGPU
StartupWMClass=Rio
Actions=New;
X-TerminalArgExec=--command
X-TerminalArgAppId=--app-id
X-TerminalArgTitle=--title-placeholder

[Desktop Action New]
Name=New Terminal
Exec=rio

Reproduce

xdg-terminal-exec --print-cmd -- htop
# with Rio as preferred/default terminal: fails or mis-invokes without the keys

Request

Please add the three X-TerminalArg* lines above to misc/rio.desktop.

References

• https://rioterm.com
• https://github.com/raphamorim/rio/blob/main/misc/rio.desktop
• https://github.com/Vladimir-csp/xdg-terminal-exec#desktop-entry-for-a-terminal
• man rio (-e, --command, -w, --working-dir, --title-placeholder)