Add more info to the goto symbol popup

[vfaronov]

To expand on #950 and #1069...

As a Python programmer, I find that the goto symbol popup is considerably more useful to me with a change like this:

-			text = g_markup_printf_escaped(_("%s: %lu"), fname, tmtag->line);
+			text = g_markup_printf_escaped(
+				_("%s\n<small>%s: %lu</small>"),
+				tmtag->scope, fname, tmtag->line);

because then I can immediately see the name of the class containing the tag, which is useful when I have 10 different classes with an execute method in each of them.

But this doesn’t work in many other cases (even in Python).

Then of course, TMTag has a bunch of other fields that might also be very useful.

Maybe there’s a way to put this information to good use without breaking the current use cases? Maybe a preference?

[elextr]

The idea sounds useful, for languages that don't have to put every class in its own file. My current project has parse() in each of ten classes.

Maybe replace the filename with the scope otherwise where the scope is a nested thing (eg my_namespace::my_sub_namespace::my_class::my_nested_class) the popup may get a bit big.

Or have preferences that allow the user to choose one or both and can then the list be expanded to add any other potential disambiguating information.

[kugel-]

+1 the file path is truly needed, I often have multiple copies of the same file open (having to work with svn).

[vfaronov]

The path could also be given relative to the project’s root, if it’s under that root.