master cfb0f1c: Add caveat about the `long' `mode-line-compact' setting

[Lars Ingebrigtsen]

branch: master
commit cfb0f1c07ca97536fdc0e472e0f14c38c982df2b
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Add caveat about the `long' `mode-line-compact' setting
    
    * doc/lispref/modes.texi (Mode Line Basics): Elaborate on the
    `long' setting.
---
 doc/lispref/modes.texi | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index 40edc90..5ac3369 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -1936,8 +1936,10 @@ the end of the mode line off to the right.  Emacs can 
``compress'' the
 mode line if the @code{mode-line-compact} variable is non-@code{nil}
 by turning stretches of spaces into a single space.  If this variable
 is @code{long}, this is only done when the mode line is wider than the
-currently selected window.  This variable can be buffer-local to only
-compress mode-lines in certain buffers.
+currently selected window.  (This computation is approximate, based on
+the number of characters, and not their displayed width.)  This
+variable can be buffer-local to only compress mode-lines in certain
+buffers.
 
 @node Mode Line Data
 @subsection The Data Structure of the Mode Line