nsEditor::CreateTxnForDeleteInsertionPoint() shouldn't use count-1 when calculating isLast, in the non-text case. r=jfrancis@netscape.com sr=sfraser@netscape.com a=pdt git-svn-id: svn://10.0.0.236/branches/MOZILLA_0_9_4_BRANCH@103047 18797224-902f-48f8-a5cc-f745e15eee43