Stitch on polygon mode in the UV editor is broken in Blender 2.93 but works in Blender 2.92 #89861

Operating system: Linuxmint 20.2 64 bits

Broken: Blender 2.93 has already the problem
Worked: Blender 2.92 worked fine

Caused by 9f3d41d4ee

Short description of error
In the UV editor Stitch doesn't work when we are in polygon mode.

There is a workaround: working in vertex mode (but polygon mode is needed because working in vertex mode is much more annoying for stitching as it starts to pick vertices of other islands too and stitch them)

Exact steps for others to reproduce the error
Open the file and right click over the selected UV polygons and select stitch. In Blender 2.92 the polygons will be stitched, in Blender 2.93 they will not stitch.

I have included the file and also 2 jpgs showing before and after stich in blender 2.92 showing that it worked there. I also tried Blender 3.00 from the buildbot and the problem continues too. So first version with the problem is Blender 2.93 and it continues in 3.00 too

Blend File:
mortero2.blend

We have these polygons to stitch:

And blender 2.93 is unable to do the stitching (the image is in 2.92):

Operating system: Linuxmint 20.2 64 bits Broken: Blender 2.93 has already the problem Worked: Blender 2.92 worked fine Caused by 9f3d41d4ee **Short description of error** In the UV editor Stitch doesn't work when we are in polygon mode. There is a workaround: working in vertex mode (but polygon mode is needed because working in vertex mode is much more annoying for stitching as it starts to pick vertices of other islands too and stitch them) **Exact steps for others to reproduce the error** Open the file and right click over the selected UV polygons and select stitch. In Blender 2.92 the polygons will be stitched, in Blender 2.93 they will not stitch. I have included the file and also 2 jpgs showing before and after stich in blender 2.92 showing that it worked there. I also tried Blender 3.00 from the buildbot and the problem continues too. So first version with the problem is Blender 2.93 and it continues in 3.00 too Blend File: [mortero2.blend](https://archive.blender.org/developer/F10224400/mortero2.blend) We have these polygons to stitch: ![01.jpg](https://archive.blender.org/developer/F10224399/01.jpg) And blender 2.93 is unable to do the stitching (the image is in 2.92): ![02.jpg](https://archive.blender.org/developer/F10224401/02.jpg)

Added subscriber: @bao2

This comment was removed by @bao2

*This comment was removed by @bao2*

Added subscriber: @lichtwerk

Changed status from 'Needs Triage' to: 'Confirmed'

Can confirm, will check

Added subscribers: @sidd017, @ideasman42

Caused by 9f3d41d4ee

CC @sidd017
CC @ideasman42

Caused by 9f3d41d4ee CC @sidd017 CC @ideasman42

Can reproduce, will check

@lichtwerk submitted a patch(D11935) for review.

@lichtwerk submitted a patch([D11935](https://archive.blender.org/developer/D11935)) for review.

This issue was referenced by 062764d5d0

This issue was referenced by 062764d5d0197ff88a0e49a758d6e6ccb0e0e13c

This issue was referenced by 038345fa56

This issue was referenced by 038345fa5650350f68df690fcd77f1ddc451b07b

Changed status from 'Confirmed' to: 'Resolved'

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Stitch on polygon mode in the UV editor is broken in Blender 2.93 but works in Blender 2.92 #89861