Issue 113700

- Load the attached bugdoc

- select B in the first (does not seem to matter if via mouse or cursor)
- if you change the font to bold, italic the character vanishes
- same goes for font color and hilight color
- it stays if you select the character B via cursor and change to underline, but
if you select B via mouse it vanishes and only the underline remains, if you
select BC via mouse the result is different as well
- selection of B via mouse will also have the chara vanish when the font size
changes

- now select B in the second line via cursor 
- if you change to bold the character remains and becomes bold
- if you change to italic it remains but also does not become italic
- it also remains when font color or hilight color get changed

- if the B in the second line is select via cursor it vanishes in all cases:
bold, italic, underline, font size, font color, font hilight color

Sometimes(!) cursor traveling also behaves odd, that also seems to depend on how
and which characters got selected.

The most peculiar thing is that the result of 
- select B in the first line via cursor and set to italic behaves completely
different to
- select B in the second line via cursor and set to italic 
In the first line it vanishes and in the second line it remains visible and
seemingly unchanged even though ALL the characters are from the very same font.
Maybe HDU can shed some light on this.