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[eclipse-pmc] API Change Request For Pushing Down F2

In order to provide F2 (Show Tooltip Description) in textual editors this
feature needs to be pushed down from the Java editor down to Platform Text.
This needs minor API additions and two deprecations:
- command and key binding definition to the plugin.xml in Platform Text
- removing command and key binding definition from the plugin.xml in JDT
Text
- new constants to help, action definition and action id interfaces
- deprecation of corresponding constants in JDT Text
- possibly additional APIs to show the 'F2' hint (not sure yet)


GOALS/BENEFITS:
- editors get the F2 (Show Tooltip Description) feature for free
- duplicated code in Ant and Debug can be removed


CORRESPONDING BUG:
- [api][hovering] Push down F2 (Show Tooltip Description) feature for
hovers
      https://bugs.eclipse.org/bugs/show_bug.cgi?id=149519


RISKS:
No known risks.


PERFORMANCE IMPACTS:
- existing code is not affected


Dani



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