Enabling capitelized letters in keyboard shortcuts in markdown editor

[Chnapik2]

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Is your feature request related to a problem? Please describe.
I was working on a markdown document the other day and I was curently in caps lock mode and noticed that ctrl + B and other keyboard shortcuts do not work. When I turned caps lock off, everything was ok.

Describe the solution you'd like
Enabling keyboard shortcuts for capitalized letters, e. g. ctrl+b = ctrl+B. I am shure that it should be an easy fix and would help with being a bit more user freindly.

[mejo-]

I checked other online editors (Notion and Google Docs) and there indeed shortcuts with capitalized characters work - but shortcuts with Shift don't (e.g. <Ctrl>+<Shift>+<B> doesn't toggle bold). I guess we should do the same.

[juliusknorr]

It hink its not about regular shift, but having caps lock activated, there both notion and google docs seem to also toggle.

[mejo-]

I reported the issue upstream: ueberdosis/tiptap#2426

Also did some local testing, and adding the uppercase key to the keymap for a mark (.e.g in Class strong in src/marks/index.js) works as expected:

	keys({ type }) {
		return {
			'Mod-b': toggleMark(type),
			'Mod-B': toggleMark(type),
		}
	}

Only downside is, that key combinations with shift (Ctrl-Shift-b in this example) will be caught as well. But as written in the upstream issue, I think that's an acceptable tradeoff.

[mejo-]

Opened a PR upstream: ueberdosis/tiptap#2478