Fix cursor location after Range::_deleteContents
Fix cursor location after Range::_deleteContents

Should always collapse to start.

gertsonderby/Squire,xfra35/Squire,ProtonMail/Squire,Endika/Squire,xfra35/Squire,ProtonMail/Squire,xiamidaxia/Squire,yuhange/Squire,yuhange/Squire,neilj/Squire,InteractiveIntelligence/Squire,natejenkins/squire,xiamidaxia/Squire,nsartor/Squire,StileEducation/Squire,lzhengms/Squire,InteractiveIntelligence/Squire,lzhengms/Squire,StileEducation/Squire,Endika/Squire,neilj/Squire,gertsonderby/Squire,natejenkins/squire,nsartor/Squire