Fix random selection when the order is descending.

This commit fix the random selection that appear when the sort is not
ascending. The problem is that sometimes the sort is not yet made (timer
is not yet fired) so the visible children list contains both sorted items
and non sorted items (at the end). translateVisibleLocation was buggy
assuming that the list is always sorted. We have now a dirty index that
indicate where the dirty items start. And then when the sort is made
the dirty index is reset. I have added auto-test for that and fix one
that was broken for Mac. The new version of the auto-test showed a crash
because of this broken selection.

Task-number:258751
Reviewed-by:thierry

1 files changed, 46 insertions, 18 deletions

diff --git a/tests/auto/qfilesystemmodel/tst_qfilesystemmodel.cpp b/tests/auto/qfilesystemmodel/tst_qfilesystemmodel.cpp
index 04e60c4..a388f0a 100644
--- a/tests/auto/qfilesystemmodel/tst_qfilesystemmodel.cpp
+++ b/tests/auto/qfilesystemmodel/tst_qfilesystemmodel.cpp
@@ -44,6 +44,7 @@
 #include "../../../src/gui/dialogs/qfilesystemmodel_p.h"
 #include <QFileIconProvider>
 #include <QTreeView>
+#include <QHeaderView>
 #include "../../shared/util.h"
 #include <QTime>
 #include <QStyle>
@@ -802,38 +803,65 @@ void tst_QFileSystemModel::sort()
     if (fileDialogMode)
         myModel->d_func()->disableRecursiveSort = true;
 
-    const QString dirPath = QString("%1/sortTemp").arg(QDir::tempPath());
-    QDir dir(dirPath);
-    dir.mkpath(dirPath);
+    QDir dir(QDir::tempPath());
+    dir.mkdir("sortTemp");
+    dir.cd("sortTemp");
+    const QString dirPath = dir.absolutePath();
     QVERIFY(dir.exists());
-    dir.mkdir("a");
-    dir.mkdir("b");
-    dir.mkdir("c");
-    dir.mkdir("d");
-    dir.mkdir("e");
-    dir.mkdir("f");
-    dir.mkdir("g");
-    QTemporaryFile tempFile(dirPath + "/rXXXXXX");
-    tempFile.open();
+
+    //Create a file that will be at the end when sorting by name (For Mac, the default)
+    //but if we sort by size descending it will be the first
+    QFile tempFile(dirPath + "/plop2.txt");
+    tempFile.open(QIODevice::WriteOnly | QIODevice::Text);
+    QTextStream out(&tempFile);
+    out << "The magic number is: " << 49 << "\n";
+    tempFile.close();
+
+    QFile tempFile2(dirPath + "/plop.txt");
+    tempFile2.open(QIODevice::WriteOnly | QIODevice::Text);
+    QTextStream out2(&tempFile2);
+    out2 << "The magic number is : " << 49 << " but i write some stuff in the file \n";
+    tempFile2.close();
+
     myModel->setRootPath(QDir::rootPath());
+    myModel->setFilter(QDir::AllEntries | QDir::System | QDir::Hidden);
+    tree->setSortingEnabled(true);
     tree->setModel(myModel);
     tree->show();
+    tree->resize(800, 800);
     QTest::qWait(500);
-    tree->expand(myModel->index(dir.absolutePath(), 0));
-    while (dir.cdUp())
+    tree->header()->setSortIndicator(1,Qt::DescendingOrder);
+    tree->header()->setResizeMode(0, QHeaderView::ResizeToContents);
+    QStringList dirsToOpen;
+    do
     {
-        tree->expand(myModel->index(dir.absolutePath(), 0));
+        dirsToOpen<<dir.absolutePath();
+    } while (dir.cdUp());
+
+    for (int i = dirsToOpen.size() -1 ; i > 0 ; --i) {
+        QString path = dirsToOpen[i];
+        QTest::qWait(500);
+        tree->expand(myModel->index(path, 0));
     }
-    QTest::qWait(250);
+    tree->expand(myModel->index(dirPath, 0));
+    QTest::qWait(500);
+    QModelIndex parent = myModel->index(dirPath, 0);
     //File dialog Mode means sub trees are not sorted, only the current root
     if (fileDialogMode)
-        QVERIFY(myModel->index(0, 1, myModel->index(dirPath, 0)).data(QFileSystemModel::FilePathRole).toString() != dirPath + QLatin1String("/a"));
+        QVERIFY(dirPath + QChar('/') + myModel->index(0, 1, parent).data(QFileSystemModel::FileNameRole).toString() != tempFile2.fileName());
     else
-        QCOMPARE(myModel->index(0, 1, myModel->index(dirPath, 0)).data(QFileSystemModel::FilePathRole).toString(), dirPath + QLatin1String("/a"));
+        QCOMPARE(dirPath + QChar('/') + myModel->index(0, 1, parent).data(QFileSystemModel::FileNameRole).toString(), tempFile2.fileName());
 
     delete tree;
     delete myModel;
 
+    dir.setPath(QDir::tempPath());
+    dir.cd("sortTemp");
+    tempFile.remove();
+    tempFile2.remove();
+    dir.cdUp();
+    dir.rmdir("sortTemp");
+
 }
 
 void tst_QFileSystemModel::mkdir()