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Re: issue #5341: Urgent corrections to (skylines) (i

From: dak
Subject: Re: issue #5341: Urgent corrections to (skylines) (issue 341350043 by address@hidden)
Date: Tue, 12 Jun 2018 04:40:55 -0700

On 2018/06/12 10:49:11, Be-3 wrote:
On 2018/06/12 10:05:17, dak wrote:
> However, cough cough, all this is an unnecessary complication.
Sorry for
> overlooking this.  Just write
> Stencil q = *s;
> […]

Just to mention it:
How about the definition of ly:stencil-rotate in
There, we should have the exact same problem, shouldn't we?

> I'm afraid I'll have to take a much more thorough look at this shit
show and
> rework its data structures.

That'd be great…

> I suggest you remove this change (which would not
> even help due to the lack of scm_remember_upto_here_1) from this
patch set,
> retaining the cosmetic parts, and I'll try coming up with something
that has a
> chance of working regarding the GC parts.

Do you mean "remove the grob rotation coding" (Stencil q = *s;).

The cosmetic part being just < and <= etc...?


Is there a simple (minimal example way) to provoke the garbage
because in my test cases, it (accidentally) worked.

It will work most of the time.  Until it doesn't.  Basically you need to
mess with the garbage collection defaults until you trigger a collection
basically on every allocation.  That will run slow as anything but has a
much higher chance of exposing such problems.

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