Improve documentation of column-related functions

* doc/lispref/text.texi (Primitive Indent, Columns):
* src/indent.c (Fcurrent_indentation, Fmove_to_column): Document
that column counting ignores invisible text.  (Bug#56837)

1 files changed, 7 insertions, 2 deletions

diff --git a/src/indent.c b/src/indent.c
index f5a2a078b98..5e33fc2e77b 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -866,8 +866,10 @@ The return value is the column where the insertion ends.  */)
 DEFUN ("current-indentation", Fcurrent_indentation, Scurrent_indentation,
        0, 0, 0,
        doc: /* Return the indentation of the current line.
-This is the horizontal position of the character
-following any initial whitespace.  */)
+This is the horizontal position of the character following any initial
+whitespace.
+Text that has an invisible property is considered as having width 0, unless
+`buffer-invisibility-spec' specifies that it is replaced by an ellipsis.  */)
   (void)
 {
   ptrdiff_t posbyte;
@@ -985,6 +987,9 @@ as displayed of the previous characters in the line.
 This function ignores line-continuation;
 there is no upper limit on the column number a character can have
 and horizontal scrolling has no effect.
+Text that has an invisible property is considered as having width 0,
+unless `buffer-invisibility-spec' specifies that it is replaced by
+an ellipsis.
 
 If specified column is within a character, point goes after that character.
 If it's past end of line, point goes to end of line.