Kiss Lorand b74335e15e Fix UTF-8 corruption in Custom G-code editor (°C and other Unicode characters) (#11521) ...

This PR fixes an issue where certain characters (for example the degree symbol ° used in °C) became corrupted after opening and saving the Custom G-code editor multiple times.

#### What was the problem?

When users added symbols like ° inside Start/End G-code, the editor would show them correctly the first time, but after reopening the dialog a few times the text would slowly change into strange characters.

#### How to reproduce

- Open any Custom G-code field
- Add a line containing °C
- Save the dialog
- Reopen it several times
- The text begins to change into unreadable characters

#### What this PR changes

The Custom G-code editor now properly loads and saves text that contains symbols such as °, so these characters stay exactly as the user typed them. This keeps Custom G-code stable across editing sessions and prevents slow corruption of Unicode characters.

#### Result

- °C and similar symbols remain correct
- No more “weird characters” appearing after multiple reopen/save cycles
- Custom G-code is preserved accurately

Fixes #11502

2026-01-09 21:25:48 +08:00

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