Returns the text in the range [start,end). Excludes undisplayed
text (text marked with tags that set the invisibility attribute) if
include_hidden_chars is FALSE. Does not include characters
representing embedded images, so byte and character indexes into
the returned string do not correspond to byte
and character indexes into the buffer. Contrast with
TextBuffer.getSlice.
Returns the text in the range [start,end). Excludes undisplayed text (text marked with tags that set the invisibility attribute) if include_hidden_chars is FALSE. Does not include characters representing embedded images, so byte and character indexes into the returned string do not correspond to byte and character indexes into the buffer. Contrast with TextBuffer.getSlice.