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431364cf16
Fixes #8616 macOS 26 (as of RC1) has some pathological performance bug where the terminal becomes unusably slow after some period of time. We aren't 100% sure what triggers the slowdown, but it is app-wide (new tabs or windows don't resolve it) and Instruments traces point directly to NSAutoFillHeuristicController. Specifically, to the `debounceTextUpdate` selector. This is all not documented as far as I can find and also not open source, so I have no idea what's going on. The best I can tell is that the NSAutoFillHeuristicController has something to do with enabling heuristic-based autofill such as SMS auth codes in text input fields. I don't know what is causing it to go haywire. SMS autofill is not desirable in a terminal app, nor is any of the other automatic autofill in macOS I know of (contact info, passwords, etc.). So, we can just disable it. This default isn't documented but I found it via a strings dump of the AppKit binary blob and comparing it to the disassembly to see how it is used. In my limited testing, this seems to work around the problem.