Left key moves to parent instead of collapsing current item, if scroll position is not left-most

In the animation below there are two runs of collapsing attempts with the use of a keyboard:

1. the left sidebar fits its contents (nodes collapse as expected)
2. the left sidebar doesn't fit its contents (nodes collapsing broken)

Steps to reproduce:

1. unpack the attached template.tar.gz
2. open CMakeLists.txt in QtCreator
3. Alt+x to open Projects in the left sidebar
4. Adjust width of the left sidebar so that "src/template/Source Files/very_long_filename.cpp" won't fit

1. Select very_long_filename.cpp in the Projects
2. Press left arrow twice on the keyboard

Behavior:

Source Files node not collapsed.

Expected behavior:

Source Files node collapsed.