Ismael Asensio authored Jan 21, 2022 and Nate Graham committed Jan 23, 2022

The implicitHeader binding from sizeHelper is getting overriden
by Kirigami.AbstractApplicationHeader (line 76), which recalculates
a preferred height using the header's childrens implicit heights.

What's really keeping the header height at the desired value are the
back and hamburger buttons, so let's keep that size also when showing
two columns

BUG: 448889
FIXED-IN: 5.24