Text selection: cleanup text obtained from engines (#6410)
Text selection: cleanup text obtained from engines (#6410)


Markismus/koreader,mwoz123/koreader,NiLuJe/koreader,koreader/koreader,koreader/koreader,NiLuJe/koreader,poire-z/koreader,Frenzie/koreader,pazos/koreader,Frenzie/koreader,poire-z/koreader,Hzj-jie/koreader