Add keyboard layout callback and name query #1696
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This adds a global callback for when the keyboard layout changes and a query for the localized, human-readable name of the current layout.
On macOS it also triggers when the mode changes for an IME, for example switching between hiragana and katakana, while on other platforms they are both referred to as
Japanese
or similar. I don't know whether or how to fix that inconsistency.On Wayland the name query returns data cached from received events but on other platforms it queries the system directly.
This PR is intended to fix #1201.
This functionality may be affected by IME support work before 3.4 release.