Eli Zaretskii <eliz@gnu.org> writes:

> Please in future submissions of the patch mention the bug number in
> the log message.

Thanks for the review! Bug number added in the updated patch.

>> --- a/doc/lispref/modes.texi
>> +++ b/doc/lispref/modes.texi
>> @@ -2163,6 +2163,18 @@ Mode Line Basics
>>  variable can be buffer-local to only compress mode-lines in certain
>>  buffers.
>>  
>> +@vindex mode-line-collapse-minor-modes
>> +  To further ``compress'' the mode line, you may customize the
>> +@code{mode-line-collapse-minor-modes} option to a non-@code{nil} value,
>> +and Emacs will hide some minor mode indicators on the mode line by
>> +collapsing them into a single clickable button.  The option can also be
>> +a list of symbols to select minor modes indicators to hide or show.  If
>> +the list starts with the symbol @code{not}, it specifies minor modes to
>> +show, otherwise it means minor modes to hide.  For example, setting it
>> +to @code{(not flymake-mode)} makes only the indicator for Flymake mode
>> +shown, and setting it to @code{(eldoc-mode)} hides only the indicator
>> +for ElDoc mode.
>
> I think this text and the preceding paragraph should be moved to the
> Emacs user manual, into the "Optional Mode Line" node.  These are
> user-facing features, so their place is not in the ELisp Reference
> manual.
>
> For the user manual, the above description of the possible values of
> mode-line-collapse-minor-modes is too detailed.  I suggest to have
> there only the first sentence, and then refer to the doc string for
> the various alternative forms of the value.

I have moved the paragraph for 'mode-line-compact' to the "Optional Mode
Line" node, and added the first sentence for
'mode-line-collapse-minor-modes' to that paragraph.

>> ++++
>> +*** New user option 'mode-line-collapse-minor-modes'.
>> +If non-nil, minor mode lighters on the mode line are collapsed into a
>> +single button.  It could also be a list to specify minor mode lighters
>                    ^^^^^^^^^^^^^^^^^^^^^^^
> "The value could also be a list..."

Fixed.

>> +(defcustom mode-line-collapse-minor-modes nil
>> +  "Minor modes for which mode line lighters are hidden.
>> +Hidden lighters are collapsed into one.
>> +
>> +The value could be a list (MODES ...) which means to collapse lighters
>> +only for MODES, or a list (not MODES ...) which means to collapse all
>> +lighters for minor modes not in MODES.  Other non-nil values make all
>> +lighters hidden."
>> +  :type '(choice (const :tag "No modes" nil)
>> +                 (repeat :tag "Modes" symbol)
>> +                 (cons :tag "All modes except"
>> +                       (const not) (repeat symbol))
>> +                 (const :tag "All modes" t))
>> +  :group 'mode-line)
>
> The :version tag is missing.

Added.