Force new splits into their own new window when Option key is held down.

[JohnSpeno]

I wanted to resubmit this patch that adds a new feature to the Sessions window. If a user holds down the Option key while pressing either of the Split buttons, then the selected sessions will open in a new window split in the requested way. I use this nearly each time I use iTerm. If there are required changes, let's discuss them here and alter the pull request as needed. Thanks.

[gnachman]

I feel like this could work if there were some visual indication when you press option, like the button labels changing. There's not a lot of space to work with, though, so it'll be tricky to find the right UI. I'm not married to the existing one, which is pretty weird, so don't be afraid to make radical changes.

[JohnSpeno]

I still have no UI chops. My lame idea was to put a string bellow the buttons that read "Holding down option key will open splits in a new window." How do you feel about that?

[gnachman]

Hm, I think it needs more work. I wonder if this is something that should be scripted since it's kind of an edge case. But I'm not really sure how scripting would hook into it either, since it needs some UI. I'm kinda stuck on this one at the moment.

[JohnSpeno]

The Mac has a long history of hidden features activated by holding down the Option key. For example, clicking on the Speak or Wi-Fi icons in the menu bar reveal different content when the Option key is down. My patch continues that proud tradition. :-)

[gnachman]

Here's what I think: we can add an icon to the buttons (shown only when option is pressed) to indicate that a new window will be used. For example, this: http://png.findicons.com/files/icons/2315/default_icon/128/open_in_new_window.png
We can eliminate the clunky "new tabs in new window", moving that functionality into opt+"new tab". Add a label that says "Press option to open in profiles in a new window", shown only when multiple profiles are selected.

[JohnSpeno]

I like how you think. When multiple profiles are selected, it would be best to have the 'New Window' button change its text to 'New Windows'.

[gnachman]

Agreed.