On windows, I can open every time the combobox with alt-down.
On Linux only, if the focus is on the down arrow, but
not if the focus is normal on the combobox edit box,
and this only if i create the control with CB_DROPDOWN,
which is not necessary on windows.
this is very annoying, to always have to use the mouse
for that.
With keyboard only, I also cannot move the focus
from the textfield to the arrow down field.
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Franz Steinhaeusler