[BUGFIX] Tooltip doesn't work properly
[BUGFIX] Tooltip doesn't work properly

Fixed #321
* the tool doen't display information about polygons which most of the area is not visible on map area
* in case you have a polygon layer that full fill the map area, the tooltip display the last polygon information and keep it on screen. after that the tooltip stops working
* after this if you choose another layer to information is not possible to get information, the tool is blocked

jancelin/lizmap-web-client,aeag/lizmap-web-client,laurentj/lizmap-web-client,makinacorpus/lizmap-web-client,nboisteault/lizmap-web-client,aeag/lizmap-web-client,makinacorpus/lizmap-web-client,jancelin/lizmap-web-client,makinacorpus/lizmap-web-client,aeag/lizmap-web-client,nboisteault/lizmap-web-client,rldhont/lizmap-web-client,laurentj/lizmap-web-client,makinacorpus/lizmap-web-client,nboisteault/lizmap-web-client,laurentj/lizmap-web-client,rldhont/lizmap-web-client,jancelin/lizmap-web-client,rldhont/lizmap-web-client,3liz/lizmap-web-client,jancelin/lizmap-web-client,nboisteault/lizmap-web-client,jancelin/lizmap-web-client,3liz/lizmap-web-client,3liz/lizmap-web-client,makinacorpus/lizmap-web-client,aeag/lizmap-web-client,aeag/lizmap-web-client,laurentj/lizmap-web-client,3liz/lizmap-web-client,rldhont/lizmap-web-client,jancelin/lizmap-web-client