On touchend on the placeholder, focus immediately, rather than delayed by a this.defer(), so that the keyboard pops up.  Fixes #11578 , refs #16725 !strict.
Do not adjust the height of the viewport on iOS if the focusedNode is read only.   Because readonly nodes don't cause the keyboard to popup.  Thanks Sebastien Brunot (IBM CCLA).  Refs #16730 !strict.