Abiword 2.6.8 the expanded font-combobox should consume much more available vertical space

0.4.12-dev-822-ge587316 gcc dbg linux

Expected result
When the font-combobox is expanded, it should consume much more (but contrary to what the screenshot does imply, most likely not necessarily all available vertical space of the parent window)
xpsp3.png

Observed result
The expanded combobox is too small in y.
0.4.12-dev-822-ge587316_Abiword_windowed.png
0.4.12-dev-822-ge587316_AbiWord_maximized.png
0.4.12-dev-822-ge587316.log

Sidenote
The ros bug is very old, as this historic screenshot (of older Abiword 2.6.4) proves r60602
That Win7-comparison-picture also shows, that the combobox does have a maximum requested height even if the screen resolution is set to a very big value.