QFileSystemModel/Windows: Make file name checking case-insensitive

Introduce a special hash modeled on the one used for QFileSystemWatcher
on Windows.

Task-number: QTBUG-31103
Task-number: QTBUG-64147
Change-Id: I69ebabe841716e4957ae3fb04fa5c43d233a3552
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>

2 files changed, 21 insertions, 7 deletions

diff --git a/src/widgets/dialogs/qfilesystemmodel.cpp b/src/widgets/dialogs/qfilesystemmodel.cpp
index 7458cfdd80..bf88aaa467 100644
--- a/src/widgets/dialogs/qfilesystemmodel.cpp
+++ b/src/widgets/dialogs/qfilesystemmodel.cpp
@@ -1100,8 +1100,8 @@ void QFileSystemModelPrivate::sortChildren(int column, const QModelIndex &parent
         return;
 
     QVector<QFileSystemModelPrivate::QFileSystemNode*> values;
-    QHash<QString, QFileSystemNode *>::const_iterator iterator;
-    for(iterator = indexNode->children.constBegin() ; iterator != indexNode->children.constEnd() ; ++iterator) {
+
+    for (auto iterator = indexNode->children.constBegin(), cend = indexNode->children.constEnd(); iterator != cend; ++iterator) {
         if (filtersAcceptsNode(iterator.value())) {
             values.append(iterator.value());
         } else {
@@ -1661,13 +1661,10 @@ void QFileSystemModelPrivate::_q_directoryChanged(const QString &directory, cons
     QStringList toRemove;
     QStringList newFiles = files;
     std::sort(newFiles.begin(), newFiles.end());
-    QHash<QString, QFileSystemNode*>::const_iterator i = parentNode->children.constBegin();
-    while (i != parentNode->children.constEnd()) {
+    for (auto i = parentNode->children.constBegin(), cend = parentNode->children.constEnd(); i != cend; ++i) {
         QStringList::iterator iterator = std::lower_bound(newFiles.begin(), newFiles.end(), i.value()->fileName);
         if ((iterator == newFiles.end()) || (i.value()->fileName < *iterator))
             toRemove.append(i.value()->fileName);
-
-        ++i;
     }
     for (int i = 0 ; i < toRemove.count() ; ++i )
         removeNode(parentNode, toRemove[i]);
diff --git a/src/widgets/dialogs/qfilesystemmodel_p.h b/src/widgets/dialogs/qfilesystemmodel_p.h
index 640225529b..e8bae4f659 100644
--- a/src/widgets/dialogs/qfilesystemmodel_p.h
+++ b/src/widgets/dialogs/qfilesystemmodel_p.h
@@ -72,6 +72,23 @@ class ExtendedInformation;
 class QFileSystemModelPrivate;
 class QFileIconProvider;
 
+#if defined(Q_OS_WIN)
+class QFileSystemModelNodePathKey : public QString
+{
+public:
+    QFileSystemModelNodePathKey() {}
+    QFileSystemModelNodePathKey(const QString &other) : QString(other) {}
+    QFileSystemModelNodePathKey(const QFileSystemModelNodePathKey &other) : QString(other) {}
+    bool operator==(const QFileSystemModelNodePathKey &other) const { return !compare(other, Qt::CaseInsensitive); }
+};
+
+Q_DECLARE_TYPEINFO(QFileSystemModelNodePathKey, Q_MOVABLE_TYPE);
+
+inline uint qHash(const QFileSystemModelNodePathKey &key) { return qHash(key.toCaseFolded()); }
+#else // Q_OS_WIN
+typedef QString QFileSystemModelNodePathKey;
+#endif
+
 class Q_AUTOTEST_EXPORT QFileSystemModelPrivate : public QAbstractItemModelPrivate
 {
     Q_DECLARE_PUBLIC(QFileSystemModel)
@@ -189,7 +206,7 @@ public:
 
         bool populatedChildren;
         bool isVisible;
-        QHash<QString,QFileSystemNode *> children;
+        QHash<QFileSystemModelNodePathKey, QFileSystemNode *> children;
         QList<QString> visibleChildren;
         int dirtyChildrenIndex;
         QFileSystemNode *parent;