[Qt-interest] The "+" disappears in QTreeView sometimes.

[Dong Tiger]

Hi,

I use QTreeView to show a tree model. The data of the model changes from
time to time.
The weird thing is sometimes the "+" symbol ahead of a parent item
disappears, even though
clicking on the place it should be still works.

I tried Qt4.6.0 and Qt4.6.2 on Windows and Linux and they all have such
problem. Is this a Qt bug?
Any way to work around it?

TIA
--
Tiger
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