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, 4 insertions, 0 deletions

diff --git a/pictureswidget.h b/pictureswidget.h
index cc1578d..b2da8ea 100644
--- a/pictureswidget.h
+++ b/pictureswidget.h
@@ -28,6 +28,7 @@ class QEvent;
 class HoverWindow;
 class PictureViewer2;
 class QAction;
+struct MappingData;
 
 class PicturesWidget : public QWidget {
     Q_OBJECT
@@ -119,14 +120,17 @@ class PicFilesModel : public SmTreeModel {
         QList<QList<QVariant> > allFiles() const;
         void removeFiles(const QList<QPersistentModelIndex> &files);
         bool changeMappings(const QList<int> &fileIds, const QList<int> &mappingIds);
+        QList<MappingData> mappingDataFromFiles(const QList<int> fileIds) const;
 
     public slots:
         void populate();
 
     private:
+        QList<int> mappingPIdsFromFiles(QList<int> fileIds) const;
         QSqlDatabase mDb;
         MappingTreeModel *mMappingTreeModel;
         QString mPopulateQS;
+        QString mMappingsQS;
         QSqlQuery *mDeleteFileQ;
         QSqlQuery *mDeleteMappingsQ;
         QSqlQuery *mAddMappingsQ;