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Removes pane splits from the worksheet.
This method clears the current split pane layout and restores the worksheet
to a single-pane view. The implementation forwards to SplitPanes(int, int)
with both arguments set to 0.
void UnsplitPanes()
Sub UnsplitPanes()
worksheet.SplitPanes(2, 2);
worksheet.UnsplitPanes();
IPanes panes = worksheet.Panes;