Commit 2517bc14 authored by Eli Zaretskii's avatar Eli Zaretskii
Browse files

Improve commentary to 'struct it' in src/dispextern.h.

parent dd41169b
......@@ -2208,7 +2208,11 @@ struct it
struct display_pos current;
/* Total number of overlay strings to process. This can be >
OVERLAY_STRING_CHUNK_SIZE. Value is dependable only when
current.overlay_string_index >= 0. Use the latter to determine
whether an overlay string is being iterated over, because
n_overlay_strings can be positive even when we are not rendering
an overlay string. */
int n_overlay_strings;
/* The charpos where n_overlay_strings was calculated. This should
......@@ -2227,7 +2231,8 @@ struct it
/* If non-nil, a Lisp string being processed. If
current.overlay_string_index >= 0, this is an overlay string from
pos. */
pos. Use STRINGP(it.string) as a test for whether we are
rendering a string or something else; do NOT use BUFFERP(it.object). */
Lisp_Object string;
/* If non-nil, we are processing a string that came
......@@ -2416,6 +2421,9 @@ struct it
and continuation glyphs, or blanks that extend each line to the
edge of the window on a TTY.
Do NOT use !BUFFERP (it.object) as a test whether we are
iterating over a string; use STRINGP (it.string) instead.
Position is the current iterator position in object. */
Lisp_Object object;
struct text_pos position;
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