GtkComboBoxEntry default height

[Costin Chirvasuta <costinc gmail com>]

Hello,

I've noticed that GtkComboBoxEntry default height is 2 pixels taller
than GtkEntry.
Also, GtkComboBox is 2 pixels taller then GtkComboBoxEntry (4 pixels
taller than GtkEntry).
GtkButton is, by default, the same height as GtkComboBoxEntry.

I would like to make all these the same height from the gtk theme
(/engine). Is that possible?

Also, I would like to align the widths of the arrow buttons beside
GtkComboBoxEntry,
GtkComboBox and GtkOptionMenu.

I hope I don't have to hack GTK in order to do this but I will if I
have to. Any ideas where to start?

Costin.