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They used to be discoverable with mnemonics (underlined letters) but those have been dead nearly thirty years…
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these still exist on windows though? you just hold alt
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Only works for like 20% of the menus though. I remember alt shortcuts reliably being on every single menu in early Windows (95? ME? XP?)
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They died when people stopped using native toolkits and started making everything an electron app.

Economics be damned, if you're going to make a native app, use the OS provided toolkits.

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Hah, I was thinking 3.1…
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GTK (and QT I do believe) also support this on GNU/Linux.
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I wouldn't say they're dead, just more hidden (e.g. GTK4 only shows them when you hold Alt). AFAIK most toolkits still support them, but app developers also have to actually define them.
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