Well, it indeed does that. I went to the console and run "M119" and "M122", and when I typed "M" again at that box it showed:
0_1535948920339_eb0b25ff-4bbb-4281-8404-12fd01648a32-image.png
It seems that the "Default G-Codes" on the Configs "List Items" will always appear first and then the remembered ones from the console.
I miss the possibility to open the history drop down list by clicking instead of by typing.