What does stacking order do?
From the Handbook:
To change the value for Stacking order:
Select the element and change the "Stacking order" value in the Inspector.
In cases where elements are allowed to overlap, Stacking order controls the order in which they are placed on top of each other. The element with the lower value will be placed behind."
Based on this, what I expected is that if there are two items attached to a note (or perhaps just potentially colliding), changing the stacking order in the Inspector will control which one appears higher (i.e. nearer the top of the page) than the other. However, this does not seem to work.
For example: attach a tempo text to a note (tempo text stacking order = 4000). Then attach stave text to the same note (stave text stacking order = 4100). Result, tempo text is shifted up and stave text is inserted below it. If I change the stacking order of the tempo text to 4200 in the Inspector so that it is now greater than that for the stave text, my expectation is that the tempo and stave text would switch positions. But they don't.
Perhaps this only works for inititial placements I thought and so I tried changing the tempo text stacking order in the Inspector before adding the stave text. However, the stave text again was inserted below the tempo text.
I tried the experiment with two stave text elements (lest call them TEXT1 added first and TEXT2 added second). Now, the stacking orders shown in the Inspector are the same, but with auto placement enabled, it is impossible to change which of the elements is on top; it is TEXT2. Changing the stacking order in the Inspector has no effect and if I try to drag TEXT1 to a position above TEXT2, TEXT2 moves up to remain on top of TEXT1.
Perhaps text is a special case I thought and tried the experiment with a fermata (stacking order = 2900) and an accent (stacking order = 2800). Curiously, the element with the higher stacking order is on top this time whereas with the tempo text and stave text it is the item with the lower stacking order (tempo text) that is on top.
Perhaps it is something to do with automatic placement I thought and tried toggling it on and off for each of the elements attached to the note. With it off, the elements are overlaid, with it on, they stack but always in the same order regardless of what has been set in the inspector.
So..., I am obviously missing something here as what I expect to happen doesn't.
When the handbook refers to an element being placed "behind" what does that mean?
Is it possible to change the vertical stacking of elements attached to a single note by changing the stacking order specified in the Inspector?
If so how?
If not, what is stacking order there for?