Web: Keyboard layout registration

[bpasero]

Currently we only bundle top 60 keyboard layouts across all platforms and allow users to upload keyboard layout in web companion themselves. Each keyboard layout out of top 60 accounts for less than 0.1% in overall but that's thousands of users. To provide a smooth on boarding experience for the long tail, we may want to build an extension which contributes popular keyboard layouts and encourage users to contribute to that extension to help us collect more variants of keyboard layouts. To some extent, it's similar to Code Snippet

The contribution schema can be simple as

"contributes": {
		"keyboardLayouts": [
			{
				"platform": "darwin",
				"path": "./dvorak.json"
			}
		]
}

The keyboard layout file contains the content generated from command *Developer: Inspect Key Mappings (JSON) *

{
	"layout": {
		"id": "com.apple.keylayout.Dvorak",
		"localizedName": "Dvorak",
		"lang": "en"
	},
	"rawMapping": {
		"KeyA": {
...
}

Once users install this type of extensions, we can do auto detection or let users to manually pick what keyboard layouts to use.

Considering the keyboard layout contributions might be pretty long, say hundreds to thousands, it would be slow to do auto detection every time when users press keys. We can have a quick keyboard layout detection process once we find that users' keyboard layout is not U.S., similar to how Ubuntu does keyboard layout detection

1. ask users to press a list of keys
2. ask users if their keyboard has some specific keys or not

[VSCodeTriageBot]

We closed this issue because we don't plan to address it in the foreseeable future. If you disagree and feel that this issue is crucial: we are happy to listen and to reconsider.

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