Fix deselection for RowSelection.SingleSelect = true

AvaloniaUI / Avalonia.Controls.TreeDataGrid

A combined TreeView/DataGrid for Avalonia.

MIT License

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Fix deselection for RowSelection.SingleSelect = true #259

Closed VMelnalksnis closed 4 months ago

VMelnalksnis commented 4 months ago

Fixes #258.

I manually tested that it fixes the issue with the sample app, and that SingleSelect = false also still works. I wasn't able to trigger pointer event handlers to cover these changes in unit tests using HeadlessWindowExtensions, but if there is any example on how to use them I'd also write the tests.