Expands selections to the closest containing pairs of single or double quotes or backticks.

The default keybinding is Ctrl+'.

With cursor at X, the command should select the string:
"Here is the X cursor"

With cursor at X, the command should select the single quoted string:
"Here is 'the X cursor' now"

With cursor at X, the command should select the double quoted string:
"Here the cursor is 'outside' the X selection"