Fix out-of-bound access in KeySymToUcs4()
Array `keysym_to_unicode_590_5fe` is only valid for range [0x590, 0x5fe] but current lower-bound is checked against 0x589. So invalid values from 0x58a to 0x58f are being allowed by current check. If any of these invalid value is passed as `keysym`, `keysym - 0x590` would underflow.
gujjwal00-master-patch-74222 in 1 minute and 13 seconds (queued for 1 second)4 jobs for