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	Tue, 19 Jul 2016 09:46:34 -0700 (PDT)
Subject:	Re: [geda-user] pcb: polygon "twin hole" bug
To:	geda-user AT delorie DOT com
References:	<alpine DOT DEB DOT 2 DOT 00 DOT 1607070651120 DOT 7286 AT igor2priv>
From:	"Charles Repetti (charlie94965 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Message-ID:	<4f9dfd62-45cd-a307-a6d9-93b7cd4333a2@gmail.com>
Date:	Tue, 19 Jul 2016 09:46:32 -0700
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Confirmed.

- Charlie


On 7/6/16 10:01 PM, gedau AT igor2 DOT repo DOT hu wrote:
> Hi all,
>
> Evan found a bug in pcb-rnd which turned out to be a bug in mainline 
> as well. It is really easy to reproduce from scratch:
>
> 1. draw a poly
> 2. draw a hole in it (strange: first click ignored?)
> 3. keep on drawing the second hole (strange: marker is not moved?)
> 4. bug: the poly of step 1 is duplicated (copied in place), and the 
> new hole is created on the new poly
>
> Important: do not switch tool between step 2 and 3! This, together 
> with the fact that it can be reproduced with both HIDs suggests it's a 
> bug in core (the strangenesses are maybe related to handling of the 
> mode variable, I have no idea how the poly gets dupped).
>
> Detecting the duplication polys:
>
> - save before and after step 4, compare the two save files; instead of 
> one poly object with two holes there are two poly objects with one 
> hole each
>
> - move the poly after step 4; expected: moving one poly; what happens 
> instead: moving the top poly, leaving the bottom poly in place
>
> - in step 3 draw the second hole so that it has an intersection with 
> the first; that intersection is the only copper hole at the end, 
> because it is not covered by any of the polygons
>
> In pcb-rnd I am still knee-deep in the conf rewrite, but I plan to 
> look at this bug after I finish. In case someone debugs this in 
> mainline, I'm interested in the result. Else I can share my 
> findings/patches when I get to it, so mainline developers can fix this 
> in mainline.
>
> Regards,
>
> Igor2
>
>

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