EditorHelpBit: Workaround crash renaming named class inheriting @tool class

[akien-mga]

This only addresses the symptom, not the root cause of the problem.

In the MRP of the linked issue, the parent class seems to not be found in DocData after renaming its child class, which seems weird. Force opening the docs of the parent class can work it around, so we seem to have inconsistent state.

Changed the same code in EditorHelp for good measure.

Fixes #102718.

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A more proper fix would be to ensure that the parent class isn't lost from the DocData when renaming the child class. Maybe we're lacking some explicit update somewhere.

The problem might also be related to the fact that the parent class is @tool in the MRP, but the derived class isn't:

$ cat mytool.gd
@tool
class_name MyTool
extends Node

$ cat test.gd
class_name Test500
extends MyTool

[akien-mga]

For the record, there seems to be cases where the derived class doesn't register its parent class as inherits at all. This is what I get right after opening the MRP, without changing the derived class name, and checking it in the Create New Node dialog (no inherits):

If I make Test800 a @tool class too, then it works:

If I remove @tool, it still works fine, even after renaming the class, but I suspect some state remains in the editor (I know @tool scripts are iffy and sometimes I need to reload a project to get them to properly update).

So anyway, this fixes the crash, but there's still lingering issues we'll want to tackle at some point.

[dalexeev]

Looks good as a workaround, but we should investigate why the crashes started recently, even though the first case has existed without a null pointer check for quite some time.

[Repiteo]

Thanks!