The number of list items is not updated, when setFontFilers() is used and the widget is visible.

Example 1:
1. Create and display QFontComboBox with QFontComboBox::MonospacedFonts
2. setFontFilters(QFontComboBox::AllFonts):
-> only the the first few fonts are shown. The number is limited to the number of MonospacedFonts.
(see attachment left: note that the scrollbar is at the bottom, but only fonts up to B.. are shown.)

Example 2:
1. Create and display QFontComboBox with QFontComboBox::AllFonts
2. setFontFilters(QFontComboBox::MonospacedFonts):
-> only the monospaced fonts are displayed, but there are a lot of empty entries at the end of the list.
(see attachment right: note the scrollbar position)