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, 1 insertions, 0 deletions

diff --git a/pictureviewer2.cpp b/pictureviewer2.cpp
index bf2dbce..36701ff 100644
--- a/pictureviewer2.cpp
+++ b/pictureviewer2.cpp
@@ -306,6 +306,7 @@ void PictureViewer2::constructInfoItem(const PicData &data, QSize picSize){
     mScene->addItem(mFnItem);
 }
 
+//FIXME!
 void PictureViewer2::constructMappingItem(const PicData &file){
     MappingTreeModel *mappingModel = static_cast<MappingTreeModel*>(SmGlobals::instance()->model("MappingTree"));
     QList<QVariant> mappings = mappingModel->mappingsForFile(file.at(PicFilesModel::Id));