The Xcode 12.3 editor is deleting both characters in a pair of sequential braces/brackets/parentheses with a single press of the 'delete' key, even though brace matching is turned off in the preferences. Is there a new preference somewhere I can use to turn off this behaviour? It's extremely disruptive when typing quickly.

I just upgraded to Big Sur and now I can't resize the navigator pane in Xcode 12.3--a major problem when a project has a directory structure deeper than two levels. Other apps (Finder, Safari) don't seem affected. More information: Not all projects/workspaces are affected. The project that was is one generated using cmake, and re-generating that project has fixed the problem.