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Area Joins Can Create Invalid Edges in Some Situations
Closed, ResolvedPublicBUG

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 745/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 398.11

Blender Version
Broken: version: 2.90 (sub 3), branch: master (modified), commit date: 2020-05-26 15:15, hash: rB1f223b9a1fce
Worked: 2.79

Short description of error
Joining areas with some complex arrangements can result in invalid edges

Exact steps for others to reproduce the error
In the following blend you will get a bad result if you join the editor at the bottom-left to the one directly above it.

Similarly, the following video (provided by @Carlos Muñoz (carlosmu) ) illustrates similar behavior:

Note that I do have a perfect fix for this, but I wanted to have a bug report on file so this issue doesn't get lost (again).

Event Timeline

Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.May 27 2020, 8:38 PM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".

The following patch should fix this, so you always get valid edges no matter the join:

https://developer.blender.org/D7859

Looks like this didn't get automatically closed by the commit message.

I hope it's okay to resolve this one.

@Harley Acheson (harley) I tried with the current build and it works fine! Thank you!