ITfRange through text services framework does not honour shiftStart shiftEnd with many applications

Question

I am implementing a text service on windows XP, using microsoft text services framework. I use ITfRange obtained through selection. With MSOffice apps as front end, the ITfRange->shiftStart interface behaves correctly. But when using with many other applications like libreoffice, google chrome, firefox etc. the ShiftStart , does not shift the start point of selection nor does ShiftEnd shift the end point of selection. What could be going wrong.

Answer 1

It's entirely possible that the applications you mention do not actually implement Text Services Framework. If an application doesn't implement Text Services Framework, then a default implementation takes over - this is the " transitory context " that I describe in my blog. In particular, you are not allowed to manipulate the selection in a transitory context (because you're not actually talking to the application).