bug#49127: Performance degradation in encode_coding_object

[Mattias Engdegård]

16 aug. 2021 kl. 19.43 skrev Eli Zaretskii <eliz@gnu.org>:

>> I don't know how this could ever work. We loop through the markers in the 
>> current buffer?
> 
> Yes.  Why do you think this loop is broken?

Because unless I misunderstood the code entirely, the current buffer has 
nothing to do with the operation at hand.

It's easy to reproduce the original problem: run Emacs in a terminal and make a 
buffer with many markers. See how the text displays slower with more markers. 
I've attached a short example; try (make-test-buffer 1000).

The attached patch fixes this problem.

lus.el
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0001-Fix-marker-traversion-in-encode_coding_object.patch
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