Get the index of the hovered table column.
Hovered column index; columns_count denotes unused space to the right, and -1 means the table is not hovered.
return hovered column.
return -1 when table is not hovered.
return columns_count if the unused space at the right of visible columns is hovered.
Can also use (TableGetColumnFlags() & ImGuiTableColumnFlags.IsHovered) instead.
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Get the index of the hovered table column.