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When a user mouses over the annotations within the gutter, a hint box appears with all the icons set on the specific line shown hoizontally. This is specifically usefull when there are multiple icons and the arrow is present. The user does not have to scroll through all the icons but have them all show side by side.
That's a good idea, lets target for 7.0. Thanks.
*** This bug has been marked as a duplicate of bug 79457 ***