[BUG] M810-M819 G-code macros: Makro invokes other macro crashes Marlin

[rubienr]

Bug Description

When running a macro that calls another macro Marlin crashes. Tested with bugfix-2.0.x at revision ac82dc4.

Configuration Files

configuration.zip

Steps to Reproduce

1. Define macro M810, then
2. define a second macro M811 that calls M810, and
3. call M811.

Example input:

M810 M400
M811 M810 | M400 | M810
M811

Example output from Octoprint console:

Send: M810 M400
Recv: ok P63 B15
Send: M811 M810 | M400 | M810
Recv: ok P63 B15
...
Recv:  M400
Recv:  M810"
Recv: echo:Unknown command: "
Recv:  M400
Recv:  M810"
Recv: echo:Unknown command: "
Recv:  M400
Recv:  M810"
Recv: echo:Unknown command: "
...
; this lines repeat until Marlin reboots

Expected behavior:
M811 calls M810 then M400 then M810.

Actual behavior:
Looks like M811 lets M810 being re-defined as "M400 | M810", then M810 is called.

Counter Example:

M810 M400
M811 M400 | M400 | M810
M811 ; ok

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