JBIDE-17886 Visual Editor: Links is not blocked when page content is fulfilled with javascript
JBIDE-18237 NPE when editing HTML page in VPE

while setting source editor documentListener was added. It is needed for visual/source tab but not needed for Preview tab
JBIDE-17705 'Connection Reset' exception reported when opening html5 files

error log output disabled
JBIDE-18275 Visual Editor: remove option of showing VPE toolbar in Eclipse toolbar

removed