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There is over 200 actions in the big IDE and their names are often too short to give novice (but sometimes also experienced) user a hint what purpose they serve. Actions should have short and human friendly descriptions associated with them. This description would be displayed in the keymap dialog as well as in the status line when mouse is over action's name in a menu.
AFAIK we use Action.SHORT_DESCRIPTION for providing a human readable names for editor actions, because swing editor actions use Action.NAME as a unique identifier in a JTextComponent's keymap. It's probably just something to be aware of...
Why is this issue different from http://www.netbeans.org/issues/show_bug.cgi?id=140543, Ondra? That one already mentions the problem of missing actions' description in Keymap panel...
Well .. the previous one was about missing descriptions in the "old" keymap panel, this one is about missing descriptions in the "new" keymap panel ;). Just kidding, I forgot I've filed it already.
*** Issue 140543 has been marked as a duplicate of this issue. ***
Bug prior to 7.0, not touched for the last 2 years --> P4.
AbstractEditorAction already has a DISPLAY_NAME_KEY which is used for this purpose.