Code model: Fix Windows issues (duplicate matches).

Ensure the code model receives file names with clean paths ('/')
and fix paths in the relevant places of the code model. Pass on clean
paths from Cpp reference find and display them correctly in the search
window tooltip.

Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/cplusplus/CppDocument.cpp

@@ -42,6 +42,7 @@
 
 #include <QtCore/QByteArray>
 #include <QtCore/QBitArray>
+#include <QtCore/QDir>
 #include <QtCore/QtDebug>
 
 /*!
@@ -108,7 +109,7 @@ private:
 
 
 Document::Document(const QString &fileName)
-    : _fileName(fileName),
+    : _fileName(QDir::cleanPath(fileName)),
       _globalNamespace(0),
       _revision(0)
 {
@@ -173,7 +174,7 @@ QStringList Document::includedFiles() const
 
 void Document::addIncludeFile(const QString &fileName, unsigned line)
 {
-    _includes.append(Include(fileName, line));
+    _includes.append(Include(QDir::cleanPath(fileName), line));
 }
 
 void Document::appendMacro(const Macro &macro)
@@ -569,3 +570,8 @@ QStringList Snapshot::dependsOn(const QString &fileName) const
 
     return deps;
 }
+
+Document::Ptr Snapshot::value(const QString &fileName) const
+{
+    return QMap<QString, Document::Ptr>::value(QDir::cleanPath(fileName));
+}

src/libs/cplusplus/CppDocument.h

@@ -341,6 +341,7 @@ public:
     QStringList dependsOn(const QString &fileName) const;
 
     void insert(Document::Ptr doc);
+    Document::Ptr value(const QString &fileName) const;
 
     using _Base::insert;
 

src/libs/cplusplus/FindUsages.cpp

@@ -121,8 +121,7 @@ void FindUsages::reportResult(unsigned tokenIndex)
     const int len = tk.f.length;
 
     if (_future) {
-        const QString path = QDir::toNativeSeparators(_doc->fileName());
-        _future->reportResult(Usage(path, line, lineText, col, len));
+        _future->reportResult(Usage(_doc->fileName(), line, lineText, col, len));
     }
 
     _references.append(tokenIndex);