How to force Conflict Resolution Window in IntelliJ if same file was edited by another user?

I am not sure whether this is a Git or IntelliJ problem we are facing. Assuming the following using Git integration in IntelliJ:

1. User A changes a text file and commits and pushes this change to branch branch1

2. User B changes the same text file but in a different line and commits to branch1

3. User B fetches the remote repository and merges the remote branch1 into the local branch1

Current Behavior: It merges wihout any conflicts (since different lines?)

Wanted Behavior: Conflict Resolution Window popups up and User must decide whether to apply all none conflicting changes.

Same question here on stackoverflow: http://stackoverflow.com/questions/24425809/how-to-force-conflict-resolution-window-in-intellij-if-same-file-was-edited-by-a