QTreeView + QAbstractItemModel + QSortFilterProxyModel = insertRows fails

[KanareykaVBusikah]

What if you check if parent is a valid index before passing it to mapToSource?

I will try, but don't see the point of it - parent is being defined just before insertRows() is called - you can see, how it is done, in comment #3.
For me it looks fine, and debugger shows normal parent - when I breakpoint on "mProxyModel->insertRows(row, 1, parent)".

What is the model of the index passed there, anyway?

Sorry, I am not sure I understand fully what you mean.
Could you explain? Or maybe the call in comment #3 will help? Getting parent and insertRows() call are shown there.
It is taken from tree selection model - so, I think it is proxy model index. Am I wrong?

[wysota]

I will try, but don't see the point of it - parent is being defined just before insertRows() is called - you can see, how it is done, in comment #3.

And it can be an empty model index...

Sorry, I am not sure I understand fully what you mean.

What is the object returned from QModelIndex::model() for that index. Is it the proxy model instance or some other model.

[KanareykaVBusikah]

And it can be an empty model index...

It is not empty definitely, this I did have checked (debuger shows row index there and correct object data and so on).

What is the object returned from QModelIndex::model() for that index. Is it the proxy model instance or some other model.

Oh, thanks really! I did not grasp, I could check the model
Will try.

[KanareykaVBusikah]

Hello again!
Sorry for long absence - there just was some important and pressing issues to be done in my life.

The idea of QModelIndex::model() helped me to understand some details, but I advanced only a little.
Now I see something in gdb output, that I can not understand and explain - I expect different to see.
I was sure I am experienced enough to understand, but no, what I see makes me completely desperate.

I made a pair of screenshot, so I hope you can help me to explain what I see - and WHY I see it.
These are screenshots of debugging insertRow.
To run the function - I a) select an item in my tree and b) enter some text (pSubject variable). Then the function is called.

qt1.jpg
On this picture you see:
- I stoped at "QModelIndex index = index from selection model"
- Pressed "F10" to move to the next statement.
Now I see the correct index variable: column = 0, row = 9, model = ExTreeProxy (that is proxy model).
It is marked with red rectangles.
So, it's everything ok on this sceen.

Then come oddnesses:
qt2.jpg

Here you see
1) mark "1" on the picture - shows what I get after statement "sourceIndex = map from index".
As I selected index - I see it in the tree, I get it correctly from selection model - so, I expect to have correct sourceIndex.
But I get invalid one.
2) mark "2" on the picture - shows what I get when I go into "else" branch.
There is an incorrect index (column=0, row=0). What is it? On what reason index changed?

I thought this might be some errors in debugger - and I have build gdb from source.
But this did not help. I see the same oddnesses again.

Can you help in any way? Explain why I see this for the beginning...