Basic JSX attribute snippet fixes

[zardoy]

Fixes #51845
Fixes #47302

It wasn't working in the following cases:

;<SomeElem foo={''} [||] />
;<SomeElem foo={''} [||] x />
;<SomeElem foo={''} x[||] />
;<SomeElem foo={''} x[||] f />

(see linked issue with playground link)

On that line:

TypeScript/src/services/completions.ts

Line 2848 in 1f32fef

if (previousToken.kind === SyntaxKind.CloseBraceToken && currentToken.kind === SyntaxKind.GreaterThanToken) {

;<div foo={''} [||] /> // currentToken.kind = Slash
;<div foo={''} [||] test /> // currentToken.kind = Identifier

I couldn't figure out why currentToken.kind === SyntaxKind.GreaterThanToken is being used here, documentation comment doesn't state why this restriction is required. Also I saw all tests are passing locally.

[zardoy]

It also seems to be fixing #47302 not sure why, but I added tests and updated body

[andrewbranch]

Thanks @zardoy!