UiBinder template editor suggestions priority

The editor seems to ignore priority of suggestions as provided by Eclipse. When I type panel, I get as first suggestion AbsolutePanel, then CaptionPanel and so on, instead of Panel as the best match.

Start by reproducing the UiBinder template editor behavior described in the issue, typing "panel" and comparing the suggestion order with Eclipse's provided priorities. Trace the editor's completion-suggestion entry point and verify that Panel appears before AbsolutePanel and CaptionPanel when the fix is complete.

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