Send client dimensions on connection, avoid a race condition.
Send client dimensions on connection, avoid a race condition.

Fixes #429

danr/kakoune,jkonecny12/kakoune,Somasis/kakoune,mawww/kakoune,jjthrash/kakoune,Somasis/kakoune,jjthrash/kakoune,mawww/kakoune,occivink/kakoune,jkonecny12/kakoune,alexherbo2/kakoune,Somasis/kakoune,casimir/kakoune,jjthrash/kakoune,Somasis/kakoune,ekie/kakoune,occivink/kakoune,danr/kakoune,mawww/kakoune,jkonecny12/kakoune,jkonecny12/kakoune,danr/kakoune,mawww/kakoune,danr/kakoune,ekie/kakoune,lenormf/kakoune,flavius/kakoune,ekie/kakoune,casimir/kakoune,ekie/kakoune,casimir/kakoune,flavius/kakoune,alexherbo2/kakoune,alexherbo2/kakoune,lenormf/kakoune,lenormf/kakoune,flavius/kakoune,flavius/kakoune,occivink/kakoune,casimir/kakoune,occivink/kakoune,jjthrash/kakoune,lenormf/kakoune,alexherbo2/kakoune