Language Server formatting options are hardcoded

[kaloyan-raev]

Formatting options passed to language servers are hardcoded to:

• insertSpaces = true
• tabWidth = 3 (why 3 ?!)

The insertSpaces = true value comes from here: https://github.com/eclipse/che/blob/master/plugins/plugin-languageserver/che-plugin-languageserver-ide/src/main/java/org/eclipse/che/plugin/languageserver/ide/editor/LanguageServerFormatter.java#L179

The tabWidth = 3 value seems to come from here: https://github.com/eclipse/che/blob/master/ide/che-core-ide-api/src/main/java/org/eclipse/che/ide/api/editor/editorconfig/DefaultTextEditorConfiguration.java#L35

Reproduction Steps:

1. Launch a Node stack with the JSON LS Agent activated
2. Open a JSON file in the editor
3. Format the document

Expected behavior:

The document is formatted according to the current user preferences.

Observed behavior:

The document is formatted with a hardcoded settings. The user preferences are not applied.

Che version: latest master
OS and version: Fedora 24
Docker version: 1.10.3
Che install: local build

Additional information:

• Problem started happening recently, didn't happen in an older version of Che: [No]
• Problem can be reliably reproduced, doesn't happen randomly: [Yes]