QmlDesigner: Do not show icons for the itemlibrary in resources

Everything that is in or below a designer folder with a *.metainfo file
is not supposed to show up in the resource browser.
The code is written very defensive way and we check a maximum
of 3 directories above the current file.

Change-Id: I14b3ae8a7e47208e15e9adfc1696c531a8589231
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/qmldesigner/components/itemlibrary/customfilesystemmodel.cpp

@@ -88,6 +88,33 @@ void CustomFileSystemModel::setFilter(QDir::Filters)
 
 }
 
+QString filterMetaIcons(const QString fileName)
+{
+
+    QFileInfo info(fileName);
+
+    if (info.dir().path().split("/").contains("designer")) {
+
+        QDir currentDir = info.dir();
+
+        int i = 0;
+        while (!currentDir.isRoot() && i < 3) {
+            if (currentDir.dirName() == "designer") {
+                if (!currentDir.entryList({"*.metainfo"}).isEmpty())
+                    return {};
+            }
+
+            currentDir.cdUp();
+            ++i;
+        }
+
+        if (info.dir().dirName() == "designer")
+            return {};
+    }
+
+    return fileName;
+}
+
 QModelIndex CustomFileSystemModel::setRootPath(const QString &newPath)
 {
     beginResetModel();
@@ -114,7 +141,7 @@ QModelIndex CustomFileSystemModel::setRootPath(const QString &newPath)
     QDirIterator fileIterator(newPath, nameFilterList, QDir::Files, QDirIterator::Subdirectories);
 
     while (fileIterator.hasNext())
-        m_files.append(fileIterator.next());
+        m_files.append(filterMetaIcons(fileIterator.next()));
 
     QDirIterator dirIterator(newPath, {}, QDir::Dirs | QDir::NoDotAndDotDot, QDirIterator::Subdirectories);
     while (dirIterator.hasNext())