[feature request] Offer code mark styles and gutter marks

[darkred]

(Using VSCode 1.3.0 in win 10 x64 build 10586 with vscode-eslint extension 1.10.18).

Currently the code marks(for errors and warnings) appear only as squiggly underline (i.e. as spellchecker errors in browsers, e.g. Firefox, Chrome):
(the error is in red, and the warning is in green)

My suggestion is to offer more code mark styles (ideally the outline style, as it highlights the errors/warnings the best way -see below- ) and gutter marks :
(with the errors to be in red, and the warnings to be in yellow, as ESLint itself uses these colors - not green)

(here is another screenshot)

It's more easy to distinguish the errors this way.

Thank you

---

For reference SublimeLinter3 package offers five different code mark styles :

• fill,
• outline (the default style),
• solid underline,
• squiggly underline, and
• stippled underline

and two types of gutter marks:

• errors, and
• warnings

[AndrewIngram]

I found myself searching around for a setting to enable this, I guess i've been heavily spoiled by Atom and Sublime. This is pretty important for me, because I find the squiggly lines to be far too difficult to see when scrolling through a file.

[glebec]

I second the use of yellow for warning. For one thing, red-green is always a poor UI choice as it ignores the 7%+ of XY-chromosomal people who have red-green color blindness. For another, it matches ESLint. Also yellow just feels more like a warning than green, culturally speaking.

Also, the gutter marks can be very helpful, though in the case of VSC it might require some different style as VSC's breakpoint markers are very similar to SublimeLinter error marks.

[dbaeumer]

Moving to vscode since such a feature has to be implemented in the editor.

[dbaeumer]

This issue was moved to microsoft/vscode#9209