Since X11 does not provide a localized version of virtual keys, I mapped the X11 event's KeySym to such a "virtual-key code", using evt.keycode only as a fall back. It's not perfect but close to what Windows and macOS have.

 * 0x00         (unknown virtual key)
 * 0x01         XK_space (shifted from Latin-1)
 * 0x02         XK_comma (shifted from Latin-1 OR guessed from xKeycode)
 * 0x03         XK_period (shifted from Latin-1 OR guessed from xKeycode)
 * 0x04 .. 0x07 (unused)
 *
 * 0x08 .. 0x1f SPECIAL KEYS 1 (from all-mask 0xff00)
 * 0x20 .. 0x29 NUMERIC ASCII KEYS (shifted from Latin-1)
 * 0x2a .. 0x43 ALPHABETIC ASCII KEYS (shifted from Latin-1)
 *
 * 0x44         US_MINUS (guessed from xKeycode)
 * 0x45         US_PLUS (guessed from xKeycode)
 * 0x46         US_LBRACKET (guessed from xKeycode)
 * 0x47         US_RBRACKET (guessed from xKeycode)
 * 0x48         US_COLON (guessed from xKeycode)
 * 0x49         US_QUOTE (guessed from xKeycode)
 * 0x4a         US_TILDE (guessed from xKeycode)
 * 0x4b         US_BACKSLASH (guessed from xKeycode)
 * 0x4c         US_COMMA (guessed from xKeycode)
 * 0x4d         US_PERIOD (guessed from xKeycode)
 * 0x4e         US_SLASH (guessed from xKeycode)
 * 0x4f         US_102 (guessed from xKeycode)
 *
 * 0x50 .. 0xff SPECIAL KEYS 2 (from all-mask 0xff00)

See /usr/include/X11/keysymdef.h to understand the "SPECIAL KEYS" (masked 0xff00).

The biggest remaining issue is all those "OEM keys", which means the ones you push for "+" or "/" or "~" and so on.

Note that the idea of having a localized version of the virtual key is that you can print it in an application's user interface. Would be really annoying if an app insists on, e.g., Z while you actionally pushed Y.

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