Where it would return a nonsense offset when called for the end of
the document if the last line had line widgets above it.

Issue #4557

Since it's increased the strangeness of the userAgent string again

Issue #4408

Since this raises an exception in IE8

Should fix #1862 for ltr text.

This variable was unused after 0e545326.

when forced after compositionend event.

Issue #4441

Since the input object might try to read from that on focusing

Issue #4439

Closes #4412