Visualizer modes are being needlessly destroyed

With this new change, comes a few new bugs.

As we change modes (either by cycling the modes, switching between windowshade and normal, toggling double size mode...), the visualizer is being reinitialized needlessly, whereas the previous implementation never did this.

Start by reproducing the issue while cycling visualizer modes, switching windowshade and normal modes, and toggling double-size mode. Trace when the visualizer is initialized during those transitions; done means mode changes preserve the existing visualizer without needless reinitialization.

Written by the indexing model from the issue text.