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handle case when alt gr not defined in keyboard layout #653

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handle case when alt gr not defined in keyboard layout #653

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11 changes: 10 additions & 1 deletion lib/pynput/_util/xorg.py
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,10 @@ def _find_mask(display, symbol):
modifier_keycode = display.keysym_to_keycode(
Xlib.XK.string_to_keysym(symbol))

if modifier_keycode == 0:
# No such modifier key defined in the display
return 0

for index, keycodes in enumerate(display.get_modifier_mapping()):
for keycode in keycodes:
if keycode == modifier_keycode:
Expand Down Expand Up @@ -320,8 +324,13 @@ def keyboard_mapping(display):
if not normalized:
continue

group_states = [False, True]
if group_mask == 0:
# No altgr keysyms, so we can skip this group
group_states = [False]

# Iterate over the groups to extract the shift and modifier state
for groups, group in zip(normalized, (False, True)):
for groups, group in zip(normalized, group_states):
for keysym, shift in zip(groups, (False, True)):
if not keysym:
continue
Expand Down