Add workspace/configuration handler that recognizes insertSpaces/tabSize

[mfussenegger]

If using a eclipse.jdt.ls version that includes
eclipse-jdtls/eclipse.jdt.ls#1657 this will finally
make code-actions respect the clients shiftwidth/expandtab options and
no longer include tabs when the user uses spaces.

The alternative to overriding the handler would have been to document
that users should include these options in their config.settings, but
given that there is no good reason that I can think of where you don't
want to respond with your local editor settings it seems justified to
include this out of the box instead of requiring every user to add this.

[Jumziey]

Being one who work on different java project with different standards, it was really confusing why the jdtls wouldn't pick up the tabsize and insertSpace settings of the format.xml that was specific for the project. Now i know why at least... This should at least be documented in the readme 😅 (sure would have saved me a few evenings).

Granted you probably want to have these settings set the same, since it will be a bit yanky otherwise. But if you're dumb as me and start of with the formatting rules and then get annoyed at the editor settings and fix them, it can be rather confusing 😂

Psst: freakin' awesome work with this plugin, this together with your blog post have actually made java development enjoyable form me.

[mfussenegger]

Not really sure where to put this as I don't document the format.xml at all but instead refer to the eclipse.jdt.ls wiki.

Any suggestions? I'm thinking of adding an item to the troubleshooting list.

[Jumziey]

Troubleshooting list is fine IMO :)

It's that or perhaps a note about it where you refer to the eclipse.jdt.ls wiki ^^