Add warning when XML is not bound to a grammar

[angelozerr]

When we try to bound a grammar to a XML file and this binding is not well confured (ex: XML file associations is not well configured, XML catalog not well configured) it's hard to see that.

A proposition si to mark XML root element as warning ("no grammar constraints") like WTP does:

This warning should be a preference. @fbricon @NikolasKomonen what do you think about this idea?

[fbricon]

preference value should be an enum: {ignore, hint, info, warning, error}

I'd use hint by default, as I find it less intrusive. It doesn't generate a marker in the problems view in vscode, only in the open file.

[angelozerr]

Perfect!

[angelozerr]

@fbricon @NikolasKomonen I have implemented this feature. I must write test yet.

I have choosen warnNoGrammar as preference name https:/angelozerr/lsp4xml/blob/master/org.eclipse.lsp4xml/src/main/java/org/eclipse/lsp4xml/extensions/contentmodel/settings/ContentModelSettings.java#L26 but if you don't like it, please tell me, I will change it.

[fbricon]

can we call it "problems.noGrammar"? It'll allow us to handle similar messages in the future. And there's no severity implied in the name.

[angelozerr]

can we call it "problems.noGrammar"?

You mean having ContentModelSettings#getProblems()#setNoGrammar(String noGrammar) ?

[fbricon]

yes

[angelozerr]

Done @fbricon

[angelozerr]

@fbricon I reopen this issue because I must write tests.