#581 Fixes #3949 - Macro Display_Shortcuts show no/wrong results

[Marc Häfner]

Fixes [#3949] and [#3785] which seem to be duplicates.

The shortcut properties for actions are handled by their corresponding ActionSet and can not be found in the global properties.

Asking jEdit.getProperty may sometimes return properties from plugins but not jEdits actual shortcuts.

[Marc Häfner]

Addendum for the historically inclined: Using jEdit.getProperty was correct until [r20156] - "beginning of jEdit's keymap api" (jEdit 5.0)

[Alan Ezust]

Committed 24447. Thanks!