Fixed one more issue with IE8 and the mceInsertContent functionality.
Fixed one more issue with IE8 and the mceInsertContent functionality.

ikuchmin/tinymce,1099511627776/tinymce,FernCreek/tinymce,MediehusetTek/tinymce,kencheung/tinymce,bsuh/tinymce,rbecheras/tinymce,ChristophKaser/tinymce,toxalot/tinymce,mplank/tinymce,adaptiffdesigns/tinymce,danielpunkass/tinymce,widgetfactory/tinymce,gencer/tinymce,danielpunkass/tinymce,Razzwan/tinymce,jtark/tinymce,leofeyer/tinymce,toxalot/tinymce,howanghk/tinymce,ETSI-CTI/TinySpecMCE,fhchina/tinymce,aduth/tinymce,adaptiffdesigns/tinymce,henrythewasp/tinymce,Zimbra/tinymce,sjbufton/tinymce,simachewh/tinymce,leofeyer/tinymce,danielpunkass/tinymce,pmpl-5/tinymce,mplank/tinymce,blakewallan/tinymce,fhchina/tinymce,Kindling/tinymce,M4R7iNP/tinymce,gabixdev/tinymce,jtark/tinymce,enfold/tinymce,1099511627776/tinymce,MediehusetTek/tinymce,howanghk/tinymce,enfold/tinymce,ETSI-CTI/TinySpecMCE,ice8lue/tinymce,cclaerhout/tinymce,nikolas/tinymce,danchr/tinymce,jashua212/tinymce,VioletLife/tinymce,kencheung/tinymce,gabixdev/tinymce,endjin/tinymce,rednose-public/tinymce,dziemian007/tinymce,Razzwan/tinymce,nikolas/tinymce,ChristophKaser/tinymce,widgetfactory/tinymce,M4R7iNP/tinymce,shilpi230/tinymce,nbcp/tinymce,TeamupCom/tinymce,support-dot-com/tinymce,ikuchmin/tinymce,rxl194/tinymce,bsuh/tinymce,aduth/tinymce,shilpi230/tinymce,Zimbra/tinymce,FernCreek/tinymce,collective/tinymce,nbcp/tinymce,FernCreek/tinymce,Kindling/tinymce,endjin/tinymce,simachewh/tinymce,ice8lue/tinymce,sachgits/tinymce,blakewallan/tinymce,tinymce/tinymce,gencer/tinymce,fashionsun/tinymce,TeamupCom/tinymce,cclaerhout/tinymce,tinymce/tinymce,pmpl-5/tinymce,rednose-public/tinymce,fillabs/TinySpecMCE,tinymce/tinymce,sachgits/tinymce,Shopify/tinymce,jashua212/tinymce,VioletLife/tinymce,support-dot-com/tinymce,danchr/tinymce,henrythewasp/tinymce,dziemian007/tinymce,rbecheras/tinymce,fillabs/TinySpecMCE,fashionsun/tinymce,collective/tinymce,rxl194/tinymce,sjbufton/tinymce