Sorry guys, this one escaped my attention.
Unfortunately I could not get it working properly. The accelerator keys in Document properties > Tab Page for the unit selectors "Default _units" and "U_nits", that are already available for a long time, also do not work, so probably there is a problem in the unit selector widget.
For now, dropped the accelator key added in r9858.
Sorry guys, this one escaped my attention.
Unfortunately I could not get it working properly. The accelerator keys in Document properties > Tab Page for the unit selectors "Default _units" and "U_nits", that are already available for a long time, also do not work, so probably there is a problem in the unit selector widget.
For now, dropped the accelator key added in r9858.