Do not use hint text for Editor cursor positioning

When hint text is used for cursor positioning, the cursor may end up
in opposite direction when the locale and the hint text directions are
different. This CL uses the main text layout and discards the hint
layout while deciding on the position of those three views. The change
also includes fix for cursor and floating popup not displaying for
some cases after the change.

Bug: 22358087
Change-Id: I083d17b06273bc1d9b67656c5e12d4ff1231219c