GLSL: Fix crash when built with Qt 6

In Qt 6 references (and pointers) to elements in a container are
invalidated when the container size changes. Simply move to
std::unordered_set which guarantees references to stay valid.

Fixes: QTCREATORBUG-25641
Task-number: QTCREATORBUG-24098
Change-Id: I9f1110419bd2940c182b4a24629d9ab718ca2af6
Reviewed-by: David Schulz <david.schulz@qt.io>

src/libs/glsl/glslengine.cpp

@@ -87,30 +87,30 @@ Engine::~Engine()
 
 const QString *Engine::identifier(const QString &s)
 {
-    return &(*_identifiers.insert(s));
+    return &(*_identifiers.insert(s).first);
 }
 
 const QString *Engine::identifier(const char *s, int n)
 {
-    return &(*_identifiers.insert(QString::fromLatin1(s, n)));
+    return &(*_identifiers.insert(QString::fromLatin1(s, n)).first);
 }
 
-QSet<QString> Engine::identifiers() const
+std::unordered_set<QString> Engine::identifiers() const
 {
     return _identifiers;
 }
 
 const QString *Engine::number(const QString &s)
 {
-    return &(*_numbers.insert(s));
+    return &(*_numbers.insert(s).first);
 }
 
 const QString *Engine::number(const char *s, int n)
 {
-    return &(*_numbers.insert(QString::fromLatin1(s, n)));
+    return &(*_numbers.insert(QString::fromLatin1(s, n)).first);
 }
 
-QSet<QString> Engine::numbers() const
+std::unordered_set<QString> Engine::numbers() const
 {
     return _numbers;
 }

src/libs/glsl/glslengine.h

@@ -29,9 +29,10 @@
 #include "glslmemorypool.h"
 #include "glsltypes.h"
 #include <qstring.h>
-#include <qset.h>
+
 #include <functional>
 #include <set>
+#include <unordered_set>
 
 namespace GLSL {
 
@@ -91,11 +92,11 @@ public:
 
     const QString *identifier(const QString &s);
     const QString *identifier(const char *s, int n);
-    QSet<QString> identifiers() const;
+    std::unordered_set<QString> identifiers() const;
 
     const QString *number(const QString &s);
     const QString *number(const char *s, int n);
-    QSet<QString> numbers() const;
+    std::unordered_set<QString> numbers() const;
 
     // types
     const UndefinedType *undefinedType();
@@ -128,8 +129,8 @@ public:
     void error(int line, const QString &message);
 
 private:
-    QSet<QString> _identifiers;
+    std::unordered_set<QString> _identifiers;
-    QSet<QString> _numbers;
+    std::unordered_set<QString> _numbers;
     TypeTable<VectorType> _vectorTypes;
     TypeTable<MatrixType> _matrixTypes;
     TypeTable<ArrayType> _arrayTypes;