Ghostty (and any terminal reporting modified letters via the kitty CSI-u
or xterm modifyOtherKeys protocols) sends Shift+R as a lowercase keycode
with a shift modifier. keycodeToName() lowercases the printable ASCII
range, so the composer received 'r' instead of 'R' — uppercase input was
silently destroyed. The shift flag was parsed correctly but discarded at
the input layer.
Re-apply shift to a single lowercase letter in inputForSpecialSequence so
the inserted text is case-restored while keybinding consumers still see
the lowercase canonical name via key.name. Covers both the CSI-u and
modifyOtherKeys paths.
Fixes#90663
Franci Penov
c3ce41645c