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Since: Version 20210502-130208-bff6815d

The feature described in this section requires version 20210502-130208-bff6815d of wezterm, or a more recent version.

Given a string parameter, returns the number of columns that that text occupies in the terminal, which is useful together with format-tab-title and update-right-status to compute/layout tabs and status information.

This is different from string.len which returns the number of bytes that comprise the string.