bug#19551: 25.0.50; No lighter shown for `text-scale-mode' when it should be `+0'

[Stefan Monnier <monnier@iro.umontreal.ca>]

tags 19551 notabug
thanks

It's a feature.


        Stefan


>>>>> "Drew" == Drew Adams <drew.adams@oracle.com> writes:

>> > I don't know how or why this happens, but when buffer text is zoomed out
>> > and back in, so that the resulting text scale is neutral (100%, zero
>> > increase/decrease), the mode-line lighter should say `+0', as specified
>> > in the code (`face-remap.el').  For some reason, the lighter just
>> > disappears, as if the value of `text-scale-mode-lighter' were nil.
>> 
>> I don't think this is a bug.  If I understand the code correctly, the
>> lighter disappears because the minor mode is turned off when the text
>> scale is 0; see this line in `text-scale-increase':
>> 
>> (text-scale-mode (if (zerop text-scale-mode-amount) -1 1))

> Ah, right you are.  I didn't notice that.  I should have guessed this.

>> I also don't see anywhere in face-remap.el that specifies the lighter is
>> "+0" when the text scale is 0 (the default value of
>> `text-scale-mode-lighter' is "+0", but changes as soon as
>> text-scale-mode is enabled).

> It's done in `text-scale-mode':
> (setq text-scale-mode-lighter
> 	(format (if (>= text-scale-mode-amount 0) "+%d" "%d")
> 		text-scale-mode-amount))

> That sets `text-scale-mode-lighter' to "+0" when `text-scale-mode-amount' is 0.

> I'm OK with the bug being closed.