[4.5] Comments removed from Start/End G-codes when opening from .3mf

[Block137]

Application version
4.5

Platform
Win10

Printer
Custom

Reproduction steps

1. Put some G-code descriptions as new line comments in Start/End G-codes (; is the 1st character of a line)
2. Save a project as .3mf
3. Open .3mf file from step 2
4. Check Start/End G-codes again

Actual results
MOST comment only lines (lines starting with ";") were removed. Comments following actual G-codes (G28 ;home for example) remain unchanged.
Commented first line didn't get removed.

Expected results
Whole G-code scripts remain unchanged.

Project file
(For slicing bugs, provide a project which clearly shows the bug, by going to File->Save. For big files you may need to use WeTransfer or similar file sharing sites.)

Additional information
This is similar to #6689 but different condition.

[Vandrasc]

Hi @Block137 I am not able to reproduce this, my comments at the beginning of start/end g-code starting with (;) are still visible after loading the project file. Did you use any other characters? Do you still have Marlin as g-code flavor?

[rburema]

@Vandrasc I think you may need to remove the printer in between the steps, I got it to reproduce if I did that (and had multiple ';' in each start/end gcode).

[Block137]

@Vandrasc the very first line isn't affected, any other commented line will be removed. I'm using Marlin (volumetric)

[Vandrasc]

Nice! Oke good thing it is reproducible, that makes it easier for us to fix. I will bring it up with our devs, thank you for reporting it!

[fieldOfView]

@Vandrasc, there is now a PR to bring up too.

[rburema]

PR was really small & made sense so I merged it as a 5 minute fix.

For internal QA: See jira ticket CURA-7315