* Fix "index out of range" error
When the parent is the tree root element, beginInsertRows must be
called with an invalid (but legal) index. A QModelIndex with a row
index of zero when the parent has no children is an illegal index
and will result in "undefined behavior", like the "index out of
range" one.
Therefore, if our parent is the tree root element, we use QModelIndex()
instead.
Fixes#2343
Signed-off-by: Dennis Brakhane <brakhane@gmail.com>
* Use QModelIndex() instead of createIndex(-1, -1)
Both do the same, but the former is Qt best practise.
Signed-off-by: Dennis Brakhane <brakhane@gmail.com>
* add some sanity checks in debug mode
Using illegal ModelIndices can result in hard to debug problems later
on, so add a few checks to help spotting them sooner.
Signed-off-by: Dennis Brakhane <brakhane@gmail.com>
Dennis Brakhane
7f75dc6dee