Camera jumps when starting to draw a PV system

[khdlr]

Steps to reproduce:

1. Simulate building
2. Rotate/move camera
3. Click "Neue PV-Anlage einzeichnen"

Expected: Camera view stays the same
Actual: Camera jumps (only sometimes?)

[carwe]

Reason is, that the center of the building is forced to be at the center of the screen. The user should be trusted that he found camera settings that work for him, the camera should not be changed at this moment.

[FlorianK13]

As far as I understand this only happens when another building is simulated, and hence SimulationMeshes changes.