Fix bug with selection formatting outside of range

[JessicaJHee]

Fixes #1485

[datho7561]

Works very well! Thanks, Jessica!

[datho7561]

This PR addresses the issue Fred pointed out in his comment #1485 (comment), but I think the issue
Christoph pointed out might be related to the limitations of lsp4e with regards to managing spaces vs. tabs (it can't be managed on a per-file type basis from what I understand).

[laeubi]

@datho7561 I always wondered if not simply the current file style could be used when doing partial formats? I can't think about a use case where a mixed style is desirable (except the file is already mixed type).

[angelozerr]

For formatting it will work, but if you pres tabs (and your configuration is tab), it will generate a tab although you would like to have 2 spaces.

[laeubi]

I must confess I never really "configured" this :-)
Just from an users POV, the editor should be smart enough by default to simply translate this, let it be partial (or even full!) format or pressing a key that means "indent it some bit". But if it is only partially supported, even that could help, because at least I mostly use auto format rather than start intended the code/xml myself...

[angelozerr]

Before the pom.xml used WTP XML Editor. You can open it with:

And I think you should have this settings:

Today, the Maven POM Editor uses Generic Editor which uses for XML, lemminx, but badly GenericEditor cannot be configured with custom XML tabs / spaces for a given language.