Fix G43.x - G49 in active gcodes

[Sigma1912]

Current behavior shows active gcode 'G49' if current tool offset values are all zero and 'G43' if not. This leads to incorrect information if we use G43 on a tool with all zero offsets and shows 'G43' for all g43.x commands.

With this change we show
'G43', 'G43.1', 'G43.2' after the respective command
'G49' after g49 command

Note that nothing is shown at startup unless it (eg 'G49') is found in RS274NGC_STARTUP_CODE.

[Sigma1912]

Relates to #3792

[Sigma1912]

Note that there is similar code for state flags which is not modified in this PR:

linuxcnc/src/emc/rs274ngc/interp_write.cc

Line 281 in f82c475

state.flags[GM_FLAG_TOOL_OFFSETS_ON] =

linuxcnc/src/emc/rs274ngc/rs274ngc_pre.cc

Line 2212 in f82c475

g_codes[9] = tag.flags[GM_FLAG_TOOL_OFFSETS_ON] ? G_43 : G_49;

[Sigma1912]

@rmu75
I had to remove the 'G49' on startup as this gets also executed on Abort which would lead to 'G49' being shown even with tool offset applied.
This happens because (block == NULL) is True on startup AND on Abort.

If you can think of a better approach please let me know.

[rmu75]

My initial idea was to add a flag to the offsets, i.e. a "fake" offset.

[Sigma1912]

My initial idea was to add a flag to the offsets, i.e. a "fake" offset.

That was my initial idea as well but then I thought it would be nice to have 'active gcodes' reflect G43.1 and G43.2 as well.

Do you know of a way to tell if we have a Startup vs Abort event?

[rmu75]

That code here https://github.com/Sigma1912/linuxcnc/blob/4b2e51c12bcf470fba63e9d9070295c9f66cb9ab/src/emc/rs274ngc/interp_write.cc#L133 suggests block should be set if it is an abort... if it is not, sorry, no idea.

[Sigma1912]

Replaced by #3816