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Position drifts by one backlash compensation offset after stop mid-program #992

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@rcp1

Hi,

position drifts permanently by exactly one backlash compensation offset after a stop that occurs mid-program. Easy to reproduce with a small program, e.g. for z-axis ($162=0.02mm) and having a dial indicator zeroed at Z = 0:

G1 F100 Z10
G1 Z0

Stopping while moving up from the dial indicator (stop in ioSender). Then restart the program and run till end.

My build (I did not see any relevant update in newer builds regarding this):
[FIRMWARE:grblHAL]
[NVS STORAGE:*FLASH]
[FREE MEMORY:480K]
[DRIVER:iMXRT1062@600MHz]
[DRIVER VERSION:260222]
[DRIVER OPTIONS:USB.1]
[BOARD:T41U5XBB]
[AUX IO:7,3,0,0]
[NETCON:Telnet]
[PLUGIN:FS stream v1.10]
[PLUGIN:FS macro plugin v0.22]
[PLUGIN:WebUI v0.29]
[PLUGIN:SDCARD v1.27]

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