2) Select Pointer Tool (F)
a)
While you move with the pointer, the X and Y fields constantly update.3) Select Selection Tool (M)
a)
While you move with the pointer X/Y still constantly update.b) Make your first selection.
b1) In the "Position" window the selection parameter fields appear below the X/Y fields.
Those now constantly refresh while you move.b2)
X/Y don't refresh anymore. 
Would be good if X/Y would refresh all time. Then you could keep the selection but see how much further would the current X/Y position be.c) Deselect
c1) The selection parameter fields are the parameters of the mouse click (0x0px wide at top-left and bottom-cooridnates).
Worthless info, because you just clicked anywhere outside to selection deselect. Better keep the values if the last selection info.c2)
X/Y still don't refresh. Should still refresh for the reasons mentioned above.4) The position window updates only from some user interactions but not all:
Does update when you drag the corner handles or side handles. Does not update when you move the whole selection with the move cursor which you get when your mouse cursor approaches from the outside towards the selection border, shortly before reaching the selection border Does not update when you resize the selection via keyboard shortcuts (arrow keys plus various The position window should hook into the selection-object and get a refresh whenever it changes, instead of hooking into the various possible user operations leading to a selection resizing/repositioning.
Selection shortly had the issue 
demo video