Prevent Creating new Windows when using "quake" dropdown mode
[enhancement]
- iTerm2 version: any
- OS version: 10.12.5
Detailed steps to reproduce the problem:
- Open iterm2
- Enable style: full-width Top of Screen
- Try to open new window
What happened: new window
What should have happened: not allow new windows to be opened when using this "quake" dropdown style
Why: because new windows make little sense when using this style. They make it confusing since we can't know how many are opened.