[AD] Timer interrupts and drawing

[Colin Ward <lists@xxxxxxxxxx>]

I have a game here that is crashing and when I investigated it, it is
installing a timer with install_int() and in that timer's callback it is
calling drawing routines to draw things according to the mouse's current
position.

According to the documentation for install_int() you should consider that
you are being called from an interrupt context, so am I correct in thinking
that calling drawing routines from a timer callback is NOT allowed?

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