X11 pen detection: fix misclassification due to improper init #3
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xinput2_device_is_pen() was testing against default-zero values in the X11 Atom cache on at least the first round of detections, leading to imprecise detection. The patch fixes two aspects of initialisation: 1. Ensure that the selector cache is always initialised in xinput2_device_is_pen(). 2. Ensure that all X11 Atoms used in SDL_x11pen.c are instantiated if missing. This ensures that they are never None and avoids potential failures to detect hot-plugged tablet devices. Acknowledgements: @tilman3 for narrowing down the issue and an initial fix
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xinput2_device_is_pen() was testing against default-zero values in the X11 Atom cache on at least the first round of detections, leading to imprecise detection.
Description
The patch fixes two aspects of initialisation:
Ensure that the selector cache is always initialised in xinput2_device_is_pen().
Ensure that all X11 Atoms used in SDL_x11pen.c are instantiated if missing. This ensures that they are never None and avoids potential failures to detect hot-plugged tablet devices.
Existing Issue(s)
May fix libsdl-org#8611