[eclipse-pmc] API request: add API for cell navigation in tables and tre

[Boris Bokowski <Boris_Bokowski@xxxxxxxxxx>]

For quite some time now, Tom Schindl
has worked on an implementation for editable tables and trees in which
the user can navigate between cells using the keyboard.  After many
iterations, we are now happy with the design and the API for this.  We
would like to request that this API be added before M6.

GOALS/BENEFITS:
Editable tables with
  - cell highlighting and keyboard
navigation to select individual cells (optional)
  - configurable activation of
cell editors in response to different events (single-click, double-click,
keyboard)
  - the ability to move between
cells using the keyboard (e.g. TAB) when in edit mode

CORRESPONDING BUG:
https://bugs.eclipse.org/bugs/show_bug.cgi?id=172646

RISKS:
Small.  Most of this is new API,
but we did some refactoring to API that was already released in the 3.3
cycle prior to M5.  The Nebula team has provided feedback to ensure
that this will work for their Grid control as well.

PERFORMANCE IMPACT:
No performance impact.

Thanks,
Boris.