Special handling of one key mini-keyboard to mitigate visual flicker

Use pre-computed width and height of mini keyboard if
 * Popup key preview is enabled
 * The mini keyboard has only one key
 * Pre-computed width and height are specified

Bug: 5248783
Change-Id: I53475698e87d5bd67d36e63323c25a9e9f18fbb1
7 files changed
tree: fa5282d0d50dc697a5338fc7bb1088bdbde3a38a
  1. dictionaries/
  2. java/
  3. native/
  4. tests/
  5. tools/
  6. Android.mk
  7. CleanSpec.mk