Created by: Kronuz
Tooltips (and popovers) showing arrows wrongly positioned at times (centred, more commonly seen when zoom is enabled in the browser). The reason was, for example, with an arrow to be shown at the bottom of the tooltip, getViewportAdjustedDelta() returned delta with left == 0 and the test delta.left failed. In these cases, when it happened and there was an adjustment to be made (height != actualHeight), the arrow ended up being vertically centred instead of at the bottom of the tooltip.