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)

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index 6ac631ebbfca1d07e24e89185997c091d4d7c019..72fb674aa5abccb5ae11e8afc0f6709fee9a515c 100644 (file)
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -2297,6 +2297,9 @@ begins.  @xref{Usual Display}.
 amount of horizontal scrolling.  Consequently, a column value can be
 arbitrarily high.  The first (or leftmost) column is numbered 0.  They
 also ignore overlays and text properties, aside from invisibility.
+Invisible text is considered as having zero width, unless
+@code{buffer-invisibility-spec} specifies that invisible text should
+be displayed as ellipsis (@pxref{Invisible Text}).
 
 @defun current-column
 This function returns the horizontal position of point, measured in
@@ -2370,6 +2373,10 @@ This function returns the indentation of the current line, which is
 the horizontal position of the first nonblank character.  If the
 contents are entirely blank, then this is the horizontal position of the
 end of the line.
+
+This function considers invisible text as having zero width, unless
+@code{buffer-invisibility-spec} specifies that invisible text should
+be displayed as ellipsis.  @xref{Invisible Text}.
 @end defun
 
 @deffn Command indent-to column &optional minimum

diff --git a/src/indent.c b/src/indent.c
index f5a2a078b980c019622e92942bc46776c2d4801a..5e33fc2e77b754fc863227ec4848c678b88480be 100644 (file)
--- 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.