leftExpand(amount: Number, ignoreInvalid: Boolean);
amount. Number of columns by which the range should be expanded.
ignoreInvalid. Indicates whether to ignore non-existing table columns. If the parameter is True non-existing columns are ignored, if it is False they are accounted for.
The leftExpand method expands a range of table cells to the left by specified number of columns.
This method gets a Number value: the number of columns by which the range was expanded.
The example of use is given on the page with description of the TabSheetRange.bottomExpand method.
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