monitor: add prev_primary logic #826
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Track which monitors hold the current primary bit, and the monitor which
used to have it.
This is sometimes useful to infer when the primary status of a monitor
has changed, and which monitor it is now, and which monitor it used to
be.
For example:
DestroyFunc RandRFunc
AddToFunc RandRFunc
+ I Echo "Primary is: $[monitor.primary], previous: $[monitor.prev_primary]"
Fixes #825
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Track which monitors hold the current primary bit, and the monitor which
used to have it.
This is sometimes useful to infer when the primary status of a monitor
has changed, and which monitor it is now, and which monitor it used to
be.
For example:
Fixes #825