Tree View Examples: Fix Incorrect Left Arrow Behavior

[mcking65]

In all four treeview examples, if focus is on a child node and left arrow is pressed, focus moves to the parent and the parent node is closed. In this circumstance, the focus should move but the parent node should remain open. A parent node should close only if focus is on the parent node when left arrow is pressed.

[jongund]

I made a pull request this morning that I believe fixed the bug with left arrow key collapsing the leaf when not on an expandable treeitem.

[mcking65]

@jongund, this bug is indeed fixed with pull #374. Many thanks!!

[mcking65]

@jongund, Oops, this issue is not quite resolved.

If the focus is on a level two or deeper parent node that is closed, pressing left arrow moves to the parent of the parent node and closes the branch. For example, in the
file viewer tree,
navigate to reports, expand with right, move down to the first child (reports-1), then press left arrow. Focus moves to the reports parent, like it should. However, the reports branch also closes, which it should not.