[Lazarus] Treeview question

[Juha Manninen]

@Martin Collins, please see the issue:
 https://gitlab.com/freepascal.org/lazarus/lazarus/-/issues/39590
I guess Alexey started to implement TTreeNode.Enabled inspired by your post.
I continued and I believe it is quite robust now.
Please test.

Regards,
Juha
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