Bug 569946 - Replace deprecated API in MessageBox

Replace the deprecated method:
NSAlert.beginSheetModalForWindow:modalDelegate:didEndSelector:contextInfo:
with  NSAlert.beginSheetModalForWindow:completionHandler:

Follows similar pattern as File/Directory Dialog for the completion
handler.

Change-Id: I55d101400a547f9e10227825c9651c1839c5ce86
Reviewed-on: https://git.eclipse.org/r/c/platform/eclipse.platform.swt/+/171339
Tested-by: Platform Bot <platform-bot@eclipse.org>
Reviewed-by: Lakshmi P Shanmugam <lshanmug@in.ibm.com>
3 files changed
tree: f9fec6a6ed928779a2c8c001ccc92cefba423134
  1. bundles/
  2. container/
  3. examples/
  4. features/
  5. local-build/
  6. tests/
  7. .gitignore
  8. CONTRIBUTING
  9. LICENSE
  10. NOTICE
  11. pom.xml
  12. README.md
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