If I right-click the area of a slide in the main pane of my Impress window, I can choose "Change Slide Master..." and get a dialog for choosing a different master. However - the same is not true when I right-click one, or multiple-selected, slides in the Slides Pane. There is just no such context-menu item - and there really shoud be. This is definitely something I need to do revatively frequently in multi-master slide decks.
Code pointer: sd/uiconfig/simpress/popupmenu/pagepane.xml