There is currently no easy way to decrement/increment the font sizes of bullet lists with sub-levels.
The sub-levels in Impress have different font sizes for each of the sub-levels. If you mark the entire bullet list and click the icon "increment font size" (or decrement font size), the expected behavior is that all font sizes increase/decrease relatively to the current font size of the specific sub-level.
However, in Impress decreasing/increasing the font size first standardizes all font sizes of the sub-levels and then increases/decreases the font size. The result is that all levels have the same font size. Generally, this is not the wished behavior.
Competitive comparison: Powerpoint increases/decreases the font size relatively to the sub-level, so that the relative difference of the font sizes remains the same.
Note: The same misbehavior is experienced when using the increment/decrement font icon with the intention of incrementing or decrementing any block of selected text.
* Select text of variety of font sizes
* Click inc/dec font size icon
* Selected text changes font size appropriately and proportional to the size of each character.
Instead, all characters are normalized to one font size... and then incremented or decremented.
*** This bug has been marked as a duplicate of bug 91001 ***
@Maxim: Thanks a lot for working on this issue! Thanks for fixing it.
@Todd: Can you test the issue in either 5.1.0, 220.127.116.11 or 4.4.5 whether it works as expected? Thanks! (I don't have a new version on this computer)