[korganizer] [Bug 406881] Infinite loop in sortedPrenodes

[Kevin Funk]

https://bugs.kde.org/show_bug.cgi?id=406881

--- Comment #2 from Kevin Funk <kfunk at kde.org> ---
Managed to find the culprit by printing some more debug output and thereby
locating the problematic calendar folder

The final fix was to clear the Akonadi cache for that particular calendar
folder; I think that helped. Not sure how I got in that state to begin with.

I think that 'sortedPrenodes' should probably be more graceful for situations
like this and not run into an infinite loop in any case(?)

Here's the tmp patch (just for the record):
```
diff --git a/src/todo/incidencetreemodel.cpp b/src/todo/incidencetreemodel.cpp
index c6b03d4..88dc935 100644
--- a/src/todo/incidencetreemodel.cpp
+++ b/src/todo/incidencetreemodel.cpp
@@ -59,11 +59,13 @@ static PreNode::List sortedPrenodes(const PreNode::List
&nodes)
     PreNode::List remainingNodes = nodes;

     while (prenodeByUid.count() < count) {
+        qDebug() << "FOO: " << remainingNodes << "- prenodeByUid.count:" <<
prenodeByUid.count() << "- count:" << count;
         bool foundAtLeastOne = false; // this bool saves us from infinit
looping if the parent doesn't exist
         for (const PreNode::Ptr &node : nodes) {
             Q_ASSERT(node);
             const QString uid = node->incidence->instanceIdentifier();
             const QString parentUid = node->incidence->relatedTo();
+            qDebug() << "  uid" << uid << "- parent uid:" << parentUid << "-
desc:" << node->incidence->description() << "- summary:" <<
node->incidence->summary();
             if (parentUid.isEmpty()) {   // toplevel todo
                 prenodeByUid.insert(uid, node);
                 remainingNodes.removeAll(node);
```

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