[Feature request] Explicit mnemonics in action texts

[ramdomPTM]

As was posted in discussions, I'd like to suggest adding explicit mnemonics in action texts.

It seems that the controls without explicit mnemonics are automatically assigned one in Qt Widgets and Qt Quick, which is nice to have, but also leaves a hole for translators to fill.

Another problem is that sometimes mnemonics change based on contexts, which is bothering to me.

For example, in the main UI "O" and "I" are typically assigned to the "Output" and "Input".

However, if I toggle the right bottom corner menu of Equalizer and press Alt, "I" would be re-assigned to the "Import" here, albeit the menu would be immediately closed.

As the result, the "Input" in the main UI are stripped of its mnemonic.

And "O" for "Output" are substituted too, by whom I don't know.

Generally speaking, explicit mnemonics are stable thus better for ergonomics in my opinion, and are recommended in the KDE documentations too.

Plus, they can also be the handle for translators to put up localized mnemonics without guessing.

Broader inputs are welcomed. And we could come up with a draft of mnemonics for the most used controls.

[wwmm]

I tried to set a few custom mnemonics but the way i am doing it does not seem right. Sometimes two mnemonics letters are shown even if I set only one. And sometimes setting a custom letter makes the mnemonic non functional. I asked some questions about this in the Kirigami matrix. It is quite obvious that just doing something like "text: i18n("P&resets")" is not the right approach.