Correctly position popups in RTL
Correctly position popups in RTL

CSS definitions should not be flipped when we calculate elements'
positions and offsets to position other elements inside them.

Bug: T94783
Change-Id: Iaf15561409b2b61bbf31fe79bf6e340d86f01cbb

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui