ansi-color-context-region

ansi-color-context-region is a variable defined in `ansi-color.el'.
Its value is

nil

• Automatically becomes buffer-local when set.

Documentation:
Context saved between two calls to `ansi-color-apply-on-region'.
This is a list of the form (CODES MARKER) or nil. CODES
represents the state the last call to `ansi-color-apply-on-region'
ended with, currently a list of ansi codes, and MARKER is a
buffer position within an escape sequence or the last position
processed.