Fix horizontal scrollbar disappearing when rows removed #321
+88
−7
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Previously, if a horizontal scrollbar was needed to show all columns but there were no rows then no horizontal scrollbar was shown.
Fix this by getting the desired width for the
TreeDataGridRowsPresenter
from the columns if there are no rows.Had to also update the test templates to include a column scroll viewer. Because the existing tests expect the column header to be of 0 height, needed to work around AvaloniaUI/Avalonia#15075 in
TreeDataGridPresenterBase
.