Improve smart select

[inwardmovement]

Steps to Reproduce:

• editor.action.smartSelect.expand within parenthesis, backticks, single/double quotes containing a space, an hyphen, etc. (It seems ok with brackets or curly brackets).

Expected:

• A step selecting everything inside quotes.
• A step selecting everything outside quotes.

Result:

• Jumping outside quotes.

microsoft/vscode#100081

Version: 1.46.0 (user setup)
Commit: a5d1cc28bb5da32ec67e86cc50f84c67cc690321
Date: 2020-06-10T09:03:20.462Z
Electron: 7.3.1
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Windows_NT x64 10.0.18363

[fbricon]

@aeschli where is the smart selection API documented? Doesn't seem to be a part of the LSP. Its announcement is lacking some important info

[aeschli]

https://microsoft.github.io/language-server-protocol/specifications/specification-current/#textDocument_selectionRange

Given is a set of position and for each position provide a hierarchy of selection ranges.