Left Arrow key does not keep selecting parent node in QTreeView

The arrows (Left arrow key) should continue to navigate up in the tree, but it does not. This works good in windows and Linux but not in Mac. (Native Mac application does work good)

Our simpleTreeMode example can be used (without any change) to reproduce.
Steps to reproduce:

-Run simpletreemodel example and expand fourth node "From Editing Mode"
-Again expand child node of it "layouts"
-Select any child node of it or "The grid layout" and hit left arrow key

It should select parent node "Layouts" (and collapsed the node or) and further arrow hit should have collapsed it and further arrow key should select node "From Editing Mode"

But the result is it does not do any thing.