Backport fix to fillet crash?

[pjcreath]

Description

Fillet crashes (or used to) with a null pointer dereference when topologically distinct but geometrically coincident edges exist.

The offending code in 7.9.2 is here and dates back to at least 7.8.1 (where I encountered it).

The code assumes that a neighboring face Fv must contain an identical edge object E (using IsSame). However, this assumption does not always hold, resulting in a null newedge being passed down to HC->Initialize().

This was fixed in PR #743, which came after V8_0_0_rc2.

Is there any chance of backporting the null check to earlier versions?

Expected Behavior

I'd expect an error message.

Actual Behavior

It crashes with a segfault.

Sample Code or DRAW Tcl Script

n/a

Operating System

macOS

Compiler

Clang

Bitness

64-bit

OCCT Version

7.9

Additional Files

No response