Send extended scancodes for keys that require them

[obafgkmdh]

Describe your changes. Use imperative present tense.

Set the KEYEVENTF_EXTENDEDKEY flag for keys that map to extended scancodes.

This change applies to the win_sendinput_send_scancodes feature. Currently, the scancode is determined by the MapVirtualKeyA function, which does not output extended scancodes. This causes navigation keys (arrows, Home/End, PgUp/PgDn) to be mapped to the Numpad versions, and completely breaks the functionality of media keys.

I'm not very familiar with Rust, so let me know if there's a better way to address the issue.

Checklist

• Add documentation to docs/config.adoc
  • Yes or N/A
• Add example and basic docs to cfg_samples/kanata.kbd
  • Yes or N/A
• Update error messages
  • Yes or N/A
• Added tests, or did manual testing
  • Yes

[jtroo]

Thanks for the PR!

[jtroo]

Looking back at the ticket that sparked this experiment, seems there was another proposed solution:

#567 (comment)

I'll look to compare the two when I have some time.

[jtroo]

Thanks for getting me to take a look at this code area again! I've taken the code from the linked ticket as it seemed more complete.