ClangTools: Remove "in file included from" trace for header diagnostics

...as this does not add much value but rather noise.

Change-Id: I0bb8807c3f4df4114ea135bea74cde3fd21ab090
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/clangtools/clangtoolslogfilereader.cpp

@@ -25,6 +25,8 @@
 
 #include "clangtoolslogfilereader.h"
 
+#include <cpptools/cppprojectfile.h>
+
 #include <QDebug>
 #include <QDir>
 #include <QObject>
@@ -147,6 +149,10 @@ static Diagnostic buildDiagnostic(const CXDiagnostic cxDiagnostic,
         clang_disposeDiagnosticSet(cxChildDiagnostics);
     });
 
+    using CppTools::ProjectFile;
+    const bool isHeaderFile = ProjectFile::isHeader(
+        ProjectFile::classify(diagnostic.location.filePath));
+
     for (unsigned i = 0; i < clang_getNumDiagnosticsInSet(cxChildDiagnostics); ++i) {
         CXDiagnostic cxDiagnostic = clang_getDiagnosticInSet(cxChildDiagnostics, i);
         Utils::ExecuteOnDestruction cleanUpDiagnostic([&]() {
@@ -156,6 +162,9 @@ static Diagnostic buildDiagnostic(const CXDiagnostic cxDiagnostic,
         if (diagnosticStep.isValid())
             continue;
 
+        if (isHeaderFile && diagnosticStep.message.contains("in file included from"))
+            continue;
+
         if (isInvalidDiagnosticLocation(diagnostic, diagnosticStep, nativeFilePath))
             return diagnostic;