Fix keyboard mode stack underflow triggered by Kitty sequences #1386
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Kitty keyboard escape sequences such as '\x1b[2u', '\x1b[3u', and related pop events could be processed when the keyboard mode stack was already empty. This resulted in an index underflow (usize::MAX) and an out-of-bounds access, causing a panic in the PTY reader thread. Guard against excessive pops and reset keyboard mode state to prevent stack underflow and crashes.
aymanbagabas
approved these changes
Dec 16, 2025
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Kitty keyboard escape sequences such as '\x1b[2u', '\x1b[3u', and related pop events could be processed when the keyboard mode stack was already empty. This resulted in an index underflow (usize::MAX) and an out-of-bounds access, causing a panic in the PTY reader thread.
This PR guards against excessive pops and resets the keyboard mode state to prevent stack underflow and crashes.
This Closes #1385