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HTML spacing rules are complex. Any editing surface that treats the HTML as the "data model" is vulnerable to this issue. It's a problem for both native and JS impls.
IMO this isn't a valid excuse for a bad user experience even if it's a valid reason. From the user's standpoint, the app owns the entire experience. Every company I've worked for has deployed numerous workarounds for hardware bugs instead of saying "yolo, it's hardware's fault".
It's not uncommon for cloud vendors to get hardware firmware in order to fix bugs, but twitter can't fix bugs in open source browsers? It might be the right business decision to ship an app where text input is broken but, IMO, that doesn't somehow make it the browser's fault.
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