Now when you hit Enter and thus enter chat mode in-game, you can no longer move the camera by moving your mouse pointer to the screen edges or by pressing cursor keys. Clicking on the mini map still works.
I liked the behaviour much more the way it was before this change, since I am often in a situation where I start to type something, then need to check the current situation (such as of an ongoing fight) quickly, then continue writing. This is very hard now since you need to point and click on the very location on the mini map to move the camera to a specific location, which is pretty hard if you're in a hurry.