Keyboard combination to switch codepages on-the-fly

[Torinde]

Is your feature request related to a problem? Please describe.

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What you want

Can you please add a keyboard combination to switch codepages on-the-fly? The usecase is that when using a non-Latin script codepage (e.g. Cyrillic) the box drawing characters of most installers and programs are missing/rearranged (because they're hardcoded for 437).

It would be great if KEYB or DOSbox-X itself supports a key-combination to change between 437 and whatever codepage is active - for example 3021 moves around the box drawing characters and back in the day we used TSR programs allowing LeftShift + RightShift to change between the codepages on-the-fly (when you need to see something like a game installer menu, which is written in 437, but soon after you'll change back to 3021 in order to read/write in Cyrillic).

• when codepage is 437 pressing LeftShift + RightShift changes to the 'alternative' one (e.g. 3021 or whatever was set by CHCP or KEYB)
• when codepage is <>437 pressing LeftShift + RightShift changes to 437

To illustrate why LeftShift+RightShift combo is needed for user to switch to/from 437 - see how EDIT looks with 3021:

While how it should look:

Originally posted by @Torinde in #5209 (comment)

Describe alternatives you've considered

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Additional information

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