Get a legacy column boundary offset.
column_index
Zero-based column index; -1 means the current column only in APIs that support that default.
Requested legacy column boundary offset from the window left edge, in pixels.
get position of column line (in pixels, from the left side of the contents region).
pass -1 to use current column, otherwise 0..GetColumnsCount() inclusive.
column 0 is typically 0.0
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Get a legacy column boundary offset.