Foremost a fix for SmTreeModel

Not working again, but I eventually have to commit the changes. Fixes to
SmTreeModel:

* Fix SmTreeModel::index(). The previous comment was quite valid. I'm
surprised that it worked at all. I have no clue why to return an invalid
QModelIndex if the column isn't 0. Now an index with any valid column
number can be created.

* Fix SmTreeModel::parent(). Again, why shouldn't we create a parent
index with a column other than 0? No idea...

* Fix SmTreeModel::headerData(). Add some sanity checks.

* Fix SmTreeModel::findRecursive(). Well, what is there to say. It never
worked for models with a depth > 1, but obviously it didn't really
matter until now. To make it work I had to change SmTreeItem as well.
SmTreeItem::next() returns the next valid parent/sibling, or 0 if there
isn't one.

There may be some fallout from these changes, but they're yet to be
seen.

Changes to PictureView:
* fix selecting an item according to the new datasbase layout
* same goes for editing items. If an update actually works has to be
checked.

Overall, it's an intermediate commit that should have been a sane series
of commits. Can't be changed now...

1 files changed, 2 insertions, 0 deletions

diff --git a/mappingtreemodel.h b/mappingtreemodel.h
index 4b45f09..f2771c9 100644
--- a/mappingtreemodel.h
+++ b/mappingtreemodel.h
@@ -40,6 +40,7 @@ class MappingTreeModel : public SmTreeModel {
         QVariant data(const QModelIndex &index, int role) const;
         QList<QVariant> childList(const QVariant &value, int column = 0) const;
         QList<QVariant> mappingsForFile(const QVariant &fileId) const;
+        QStringList path(QModelIndex &idx) const;
         QModelIndex indexFromPath(const QString &path, int column = 0) const;
         bool setData(const QModelIndex &index, const QVariant &value, int role);
         void move(const QModelIndex &source, const QModelIndex &dest);
@@ -48,6 +49,7 @@ class MappingTreeModel : public SmTreeModel {
         bool addChild(const QVariant &name, const QModelIndex &parent);
         bool deleteChild(const QModelIndex &idx);
         int childCount(const QModelIndex &idx) const;
+        MappingData mappingDataFromIndex(QModelIndex &idx) const;
         MappingData mappingDataFromId(int mappingId) const;
         QStringList paths() const;
         const QString &forbidden() const { return mForbidden; }