Peter Humphrey <pe...@prh.myzen.co.uk> wrote:
> On Monday, 2 April 2018 21:50:30 BST Philip Webb wrote:
>> 180402 Dale wrote:
>> > After each period at the end of a sentence, I put in two spaces, not one.
>> > Something I was taught years ago somewhere and still do.
>> > I only put one after a comma tho.
>>
>> That is correct professional secretarial style, which I always follow too.
>
> Correct? In what sense?

For non-English languages it is unusual, but according to Knuth,
it is tradition in professional English typesetting to increase
(though usually not double) the amount of space between sentences:
That's why some additional space is TeX default if you do not switch
the behaviour off with \frenchspacing (the latter being default in
many non-English languages).
For details concerning fixed-width typewriters, I know only the
tradition of my country which is \frenchspacing...
I guess the section about French/English spacing in
https://en.wikipedia.org/wiki/History_of_sentence_spacing
is rather exhaustive.

>> > Could that be triggering something ?
>> > I'm using Seamonkey set to send plain text to anything Gentoo related.
>>
>> IIRC HTML defaults to collapse double spaces to single [...]
>
> KMail also has an option to collapse double spaces to one.

Since it is "forbidden" to collapse nonbreakable space, I guess
that the seamonkey editor transforms additional spaces (maybe
only if occurring after punctation signs) to nonbreakable space
to make sure that it is not lost in display.
You need a special editor/mode (like emacs) to optically distinguish
breakable (\x20) and nonbreakable (\xa0 = \x20 | \x80) space.


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