fix #8652 [based on patch by cmuelle8] enable dialog and panels hiding by TAB
disable TAB for angle snapping by default (please use A-A or assign different key)

git-svn-id: http://josm.openstreetmap.de/svn/trunk@5979 0c6e7542-c601-0410-84e7-c038aed88b3b
Merge branch 'master' into mirror