Fix issue 2960

[qzchenwl]

Fixes #2960.

[qzchenwl]

This breaks the test case:

Expected :Line 93) commentsInserter.insertComments(resultNode, comments.copy().getComments()) ==> com.github.javaparser.CommentsInserter.insertComments(com.github.javaparser.ast.Node, java.util.TreeSet<com.github.javaparser.ast.comments.Comment>)
Actual   :Line 93) commentsInserter.insertComments(resultNode, comments.copy().getComments()) ==> com.github.javaparser.CommentsInserter.insertComments(com.github.javaparser.ast.CompilationUnit, java.util.TreeSet<com.github.javaparser.ast.comments.Comment>)

parsing

	public <N extends Node> ParseResult<N> parse(ParseStart<N> start, Provider provider) {
		try {
            final ASTParser parser = getParserForProvider(provider);
			N resultNode = start.parse(parser);
            final CommentsCollection comments = astParser.getCommentsCollection();
            commentsInserter.insertComments(resultNode, comments.copy().getComments());
            
			return new ParseResult<>(Optional.of(resultNode), parser.problems, Optional.of(astParser.getTokens()), Optional.of(astParser.getCommentsCollection()));
		} catch (ParseException e) {
			return new ParseResult<>(e);
        } catch (TokenMgrException e) {
            return new ParseResult<>(e);
		} finally {
			try {
				provider.close();
			} catch (IOException e) {
				// Since we're done parsing and have our result, we don't care about any errors.
			}
		}
	}

There are two cases when argument is type variable:

1. result of evaluating a template function.
2. variable defined in template function body (same as MethodCallExpr).

They should be treat differently. Case 1 is a type waitting to be inferred, case 2 is a fixed type.

[jlerbsc]

This PR seems correct but there are few errors in unit tests.

When i try to report your correction on the current version i got this errors.

[ERROR]   AnalyseJavaSymbolSolver060Test.parseCoreJavaparsermodelContexts:182->parse:121 Line 34 of javaparser\javaparser-symbol-solver-testing\src\test\test_sourcecode\javasymbolsolver_0_6_0\expected_output/java-symbol-solver-core/com_github_javaparser_symbolsolver_javaparsermodel_contexts_StatementContext.txt is different from what is expected ==> expected: <Line 104) JavaParserFactory.getSymbolDeclarator(wrappedNode, typeSolver) ==> com.github.javaparser.symbolsolver.javaparsermodel.JavaParserFactory.getSymbolDeclarator(com.github.javaparser.ast.Node, com.github.javaparser.symbolsolver.model.resolution.TypeSolver)> but was: <Line 104) JavaParserFactory.getSymbolDeclarator(wrappedNode, typeSolver) ==> UNSOLVED>
[ERROR]   AnalyseJavaSymbolSolver060Test.parseCoreJavaparsermodelDeclarations:218->parse:121 Line 1 of javaparser\javaparser-symbol-solver-testing\src\test\test_sourcecode\javasymbolsolver_0_6_0\expected_output/java-symbol-solver-core/com_github_javaparser_symbolsolver_javaparsermodel_declarations_JavaParserTypeAdapter.txt is different from what is expected ==> expected: <Line 39) Helper.getPackageName(wrappedNode) ==> com.github.javaparser.symbolsolver.javaparsermodel.declarations.Helper.getPackageName(com.github.javaparser.ast.Node)> but was: <Line 39) Helper.getPackageName(wrappedNode) ==> UNSOLVED>
[ERROR]   AnalyseNewJavaParserTest.parseAllOtherNodes:315->parse:104 Line 5 of javaparser\javaparser-symbol-solver-testing\src\test\test_sourcecode\javaparser_new_src\expected_output\com_github_javaparser_JavaParser.txt is different from what is expected ==> expected: <Line 93) commentsInserter.insertComments(resultNode, comments.copy().getComments()) ==> com.github.javaparser.CommentsInserter.insertComments(com.github.javaparser.ast.Node, java.util.TreeSet<com.github.javaparser.ast.comments.Comment>)> but was: <Line 93) commentsInserter.insertComments(resultNode, comments.copy().getComments()) ==> com.github.javaparser.CommentsInserter.insertComments(com.github.javaparser.ast.CompilationUnit, java.util.TreeSet<com.github.javaparser.ast.comments.Comment>)>
[ERROR]   AnalyseNewJavaParserTest.parseAstRest:250->parse:104 Line 41 of javaparser\javaparser-symbol-solver-testing\src\test\test_sourcecode\javaparser_new_src\expected_output\com_github_javaparser_ast_Node.txt is different from what is expected ==> expected: <Line 351) nodes.add(clazz.cast(child)) ==> java.util.List.add(E)> but was: <Line 351) nodes.add(clazz.cast(child)) ==> UNSOLVED>
[ERROR]   AnalyseNewJavaParserTest.parseAstVisitor:292->parse:104 Line 689 of javaparser\javaparser-symbol-solver-testing\src\test\test_sourcecode\javaparser_new_src\expected_output\com_github_javaparser_ast_visitor_CloneVisitor.txt is different from what is expected ==> expected: <Line 1282) r.add(rN) ==> java.util.List.add(E)> but was: <Line 1282) r.add(rN) ==> UNSOLVED>