0.9.24: ComboBox height in GTK and GTK2

[giorgiotani]

Hi, I observed a strange bahaviour in GTK and GTK2 applications compiled with lazarus 0.9.24 on Linux, about setting height of comboboxes.
I was able to specify custom ComboBox.ItemHeight under Windows (if the ComboBox.Style is set as csOwnerDrawvariable) but the same is ignored under Linux, combobox height remains the same even if I explicitely set Height or ItemHeight (in the code as well as in the rad).

Is there an issue or GTK/GTK2 are expected ignoring this parameters?
I'm still searching info about that, but since now no luck, so I had not filed it to bug tracker and posted it here hoping someone had found a quick response or workaround for that.
Thanks in advance!