bug#34513: display-line-numbers in term mode

[Ergus]

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Hi Eli: 
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Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Mon, 21 Oct 2019 23:44:11 +0200
>> From: Ergus <spacibba@aol.com>
>> Cc: 34513@debbugs.gnu.org, monnier@iro.umontreal.ca
>>
>> >You can see the various solutions in tabulated-list.el.  I wrote them
>> >because features like package.el need to react to the changing width
>> >of the line numbers.
>> >
>> >In addition to the change in the line numbers display width due to
>> >scrolling, there are changes due to resizing the default font.
>> >
>> Hi Eli:
>>
>> I see that, but what about when the window width changes? Are there any
>> hook we ca use?
>
> Window width changes are unrelated to line numbers, right?
>
> Is window-size-change-functions what you want?

Yes they are unrelated, but the issue is the same... when and how to
trigger a line-width update/recalculation.

Actually on a windows resize the term-line width is not updated
either. So the new outputs after that assume the same window width. The
line-number-width is just another side of the same problem where the
line-width is not recalculated..

On window increase size the issue is not so annoying (it is not right,
but it works) but on window decrease size (or line-number-width
increase) it is worth because the lines adds a \ and break.

So a right fix maybe should recalculate the line-width more dynamically
(for example when inserting RET in term mode)

Does it makes sense?