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When the horizontal or vertical scrollbar value is changed in TreeView, the EndEdit() method is always called even if not currently editing a node. EndEdit() always calls Application.DoEvents() which can cause strange behavior in some cases. It seems that the Application.DoEvents() call is necessary to deal with a focus issue when editing a label, which is not happening in this case. The proposed solution would be to only call EndEdit() in the VScrollBarValueChanged() or HScrollBarValueChanged() methods if the edit_node variable is not null.
Suggested fix in https://github.com/mono/mono/pull/2547