Make workspaceSymbols work on qualified name.

[hokein]

Fixes #31

Tested on LLVM project, verified with qualified names and unqualified names.

[kadircet]

just a drive by comment. i remember this was working in vscode last time i checked (which was a looong time ago). so are we sure this is not a regression on their side (not saying we shouldn't fix it in our extension, but maybe we should also file a bug to them) ?

[hokein]

just a drive by comment. i remember this was working in vscode last time i checked (which was a looong time ago). so are we sure this is not a regression on their side (not saying we shouldn't fix it in our extension, but maybe we should also file a bug to them) ?

Not sure this is a regression, personally I didn't often use this feature in VSCode as it didn't give quite useful results (maybe because of this bug?).

The closest issue I found is microsoft/vscode#23509, it looks like they suggest to address it in the extension side.

[sam-mccall]

I filed microsoft/vscode#98125 asking for a real fix in VSCode, but this workaround seems fine, we should do it only in the cases necessary.