tritao 28f18ded85 Gui: Fix invalid scene graph mutation in EditableDatumLabel. ...

`EditableDatumLabel` uses `activate`/`deactivate` methods for showing or
hiding its widgets in the scene.

However, `activate`/`deactivate` methods can end up being called as part
of a scene graph / Coin action (`SoAction`) handler, in the context of
`SoFCUnifiedSelection`, and this ended up in a Coin warning and eventual
crash due to the scene graph being manipulated (nodes being removed),
which Coin has checks for in debug mode:

```
Coin error in SoGroup::removeChild(): tried to remove non-existent child
0x5555579c5290 (Annotation)
```

Fix this issue by using a `SoSwitch` node instead and by controling the
child visibility using it instead.

2025-01-27 17:51:40 +01:00

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