(closes#4900, closes#5449)
Some browsers need an explicit `change` event triggered on the input field
when a value has been changed by the combo and accepted by pressing return
or tab. This was only an issue on combos that aren't part of uiFields,
since the uiFields are all setup to respond to `change`,`input`,`blur` etc.
(closes#5568)
Several strategies in here:
- Move uiCombobox() from inside the render function to class variable
- Don't render stuff like the raw tag editor when it's collapsed
- Don't show as many fields/combos on hover
- Don't instantiate fields (like universal/more) until they're actually shown
- Bind the combo on enter selection not on update selection
(closes#5575)
Also improves keyboard navigation, and adds some scrollintoview
workarounds to make sure that the selected option is visible
while also not causing the whole page to move.
