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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...
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