Returns a mutable, random-access (indexable) range (TextBufferRange) containing the characters of the specified area.
The x position to start at.
The y position to start at.
How many characters per line.
How many lines.
A TextBufferRange that is configured for the given area.
See Implementation
Returns a mutable, random-access (indexable) range (TextBufferRange) containing the characters of the specified area.