IntelliJ IDEA 15.0.3
JVM: OpenJDK 64-Bit Server VM
OS X 10.11.3
1. On OS X, connect two monitors (M0 and M1).
2. Enable Separate Spaces in Preferences.
3. Place IntelliJ on M0.
4. Set Run Window to Floating Mode, and place it on M1.
5. Focus IntelliJ by clicking it.
6. Focus the Run Window by clicking it.
The Run Window teleports from M1 to M0. For example, if it was at (10,10) on M1, it now is at (10,10) on M0.
Disable Separate Space in OSX preferences.