As found in FontForge 20220308 (Windows version):
Changing the weight of some glyphs causes FontForge to hang with 100% CPU usage.

Steps to reproduce:

• Open the Cochineal-italic.otf font file (attached in zip)
• Select all glyphs (Ctrl-A)
• Go to Element / Style / Change Weight
• In the dialog, set "Embolden by" to 12 em units, and leave the other settings at their defaults:

• Click Ok. The first few glyphs appear to get emboldened as expected, but as soon as we get to the "A" glyph, FontForge will hang with 100% processor usage and never complete the operation.

Cochineal-Italic.zip