0.92 Beta. Knot effect extremely buggy for circles, ellipses.

[Mike Thomas-Faria]

In 0.92 beta [1] the knot effect is not working properly on some ellipses I've drawn. Works fine on other shapes. I make two ellipses, convert to path, overlap them. Then combine. Add knot effect. No visible results whatsoever. I've tried increasing and decreasing the Fixed Width. Nothing. Although, when I increased fixed width to an extraordinarily high number, things started happening, but not really what ought to happen.
I've tried grouping the ellipses instead of Combining. Same thing.

--
[1] based on the provided SVG file: Inkscape 0.92pre2 15127

[Alvin Penner (apenner)]

on Windows 10, Inkscape 0.92pre3 15195
- when I load the file KNOTTY PROBLEM.svg, I get the attached output in DOS:

** (inkscape.exe:13880): WARNING **: Exception during LPE Knot execution.
 lib2geom exception: Non-contiguous path (E:\Temp\Inkscape\inkscape\0.92.x_32_cmake\src\2geom\path.cpp:919)

** (inkscape.exe:13880): WARNING **: Exception during LPE Knot execution.
 lib2geom exception: Non-contiguous path (E:\Temp\Inkscape\inkscape\0.92.x_32_cmake\src\2geom\path.cpp:1000)

** (inkscape.exe:13880): WARNING **: Exception during LPE Knot execution.
 lib2geom exception: Non-contiguous path (E:\Temp\Inkscape\inkscape\0.92.x_32_cmake\src\2geom\path.cpp:919)

** (inkscape.exe:13880): WARNING **: Exception during LPE Knot execution.
 lib2geom exception: Non-contiguous path (E:\Temp\Inkscape\inkscape\0.92.x_32_cmake\src\2geom\path.cpp:1000)

[Alvin Penner (apenner)]

running Windows 10, Inkscape 0.92pre3 15195 (32 bit .exe build)

confirmed using the attached svg file. I made three rectangles, used Object to Path and then Combine and then the Knot LPE and it worked. Tried the same with three ellipses. Got the attached output instead of the LPE.

** (inkscape.exe:7056): WARNING **: Exception during LPE Knot execution.
 lib2geom exception: Non-contiguous path (E:\Temp\Inkscape\inkscape\0.92.x_32_cmake\src\2geom\path.cpp:919)

** (inkscape.exe:7056): WARNING **: Exception during LPE Knot execution.
 lib2geom exception: Non-contiguous path (E:\Temp\Inkscape\inkscape\0.92.x_32_cmake\src\2geom\path.cpp:919)

[Alvin Penner (apenner)]

-appears to be a duplicate of Bug 1627817

the workaround proposed in
https://bugs.launchpad.net/inkscape/+bug/1627817/comments/2
can also be applied retroactively. In other words, if you have applied the knot LPE previously to a set of circles and if it did not work then you may be able to apply this fix and the LPE will start to work. The svg file will probably remember the fact that you tried to use the LPE and will apply it successfully after you convert the arc elements to Beziers.