Rearrange items depth
Imagine you have a blank PDF page. You insert a diagram. Then, you use a white marker to erase some content in it and insert text over the white spaces. But the text is longer, so you take the white marker again and make some extra space. The problem is the text is now under the white ink because it was made before. It would be awesome to have the options of "bring to front", "bring forward", "send backward" and "send to back" any text processor has (Office, OpenOffice and LibreOffice, not to mention OneNote have that option).