[json] suggest used values when property name has already been used

<!-- Do you have a question? Please ask it on http://stackoverflow.com/questions/tagged/vscode. --> <!-- Use Help > Report Issues to prefill these. --> - VSCode Version: 1.19.0 and 1.19.1 - OS Version: Windows 10 Home 64 bit Steps to Reproduce: vscode used to show autocomplete option for words that existed int the file. I use vscode for keep track of my notes. I keep my plain texts (*.txt) with language mode html. Same thing is happening in JSON files. I write a property (e.g. BusNumber) and when I try to retype the property it doesn't show up in autocomplte dropdown when I am typing in JSON and I have to retype the whole property again. It used to show up as soon as I started typing two letters. In plain text if an word existed in the file it used to come as an option for autocomplete now it is not. I use vscodevim and Prettify JSON. Even after disabling those I am having the issue. <!-- Launch with `code --disable-extensions` to check. --> Reproduces without extensions: Yes