These are my results, not using the "Full Editor":
It seemed to do the right thing, didn't it?
The plot thickens
, it seems to work sometimes and sometimes not when you toggle on and off the WYSIWYG control (first one on the left, with a gliph that noone can understand but that may represent a paper clip).
It seems like "casual"
Try toggling WYSIWYG off, go to newline, type some text, toggle WYSIWYG on, select the text and change it's size to 14 (i.e. it should not change in size), toggle WYSIWYG off, verify it is between [ size=4 ] [ /size] tags, toggle WYSIWYG on, select the text and try changing it's size to 18:18
try a few times, sometimes it works sometimes it doesn't
when this happens in the dropdown list BOTH 14 and 18 look "selected" or light blue.