Bug 1214: Fix Deadlock in screenPositionChanged(..); Use screenPositionChanged(..) in size[Screen]PosInsetsChanged(..) on OSX; Cleanup OSX Code

- Fix Deadlock in screenPositionChanged(..)
  Defer requires to spawn whole child-window action to another thread
  since we may come from native 'NewtWindow::windowDidMove()' on MainThread.

- Use screenPositionChanged(..) in size[Screen]PosInsetsChanged(..) on OSX
  Move callback WindowImpl::sizePosInsetsChanged(..)
  to OSX's WindowDriver::sizeScreenPosInsetsChanged(..),
  since we need to use screenPositionChanged(..) to calculate
  child window relative position to parent.
  I.e. we receive the location on screen.

- Cleanup OSX Code
  - Native JNI entries shall handle NULL windowHandle -> return

  - Clarify usage of 'getWindowHandle()' and use 'isNativeValid()'
    if appropriate.

  - Don't re-use cached getWindowHandle()
    for non-blocking off-thread actions, since handle may become invalid.

  - Clarify getLocationOnScreen*(..) implementation code,
    i.e. separate getLocationOnScreenByParent(..) semantics.

0 files changed, 0 insertions, 0 deletions