add ctrl-alt-[ shortcut for indentAuto

[minrk]

aka cmd-opt-[

indentAuto is CodeMirror's best guess for the indentation.

This is the shortcut from TextMate, I didn't look up other editors if there's a better choice.

I also moved the common cell commands to Cell base config.

closes #951

[jdfreder]

I was going to suggest adding a block comment shortcut, but I checked CodeMirror.commands, and it's not available 😭

[jdfreder]

👍 to this shortcut

[elmerehbi]

Thanks for the shortcut though this is not what I was implying in the other issue. I made a screencast to show this.

[minrk]

@elmerehbi that looks an awful lot like the feature that this adds:

what's different that you are looking for?

[elmerehbi]

@minrk Exactly what I'm looking for. What is it?

[minrk]

That's the shortcut added by this PR: ctrl-alt-[

[elmerehbi]

Well I remember trying it but it didn't give the same result (not to this code I grabbed online). i'll give it another try.

[elmerehbi]

@minrk I have version 4.0.6 from Anaconda. The shortcut is not in the list. How can I get it?

[takluyver]

The bug was closed because the shortcut was added to the development version. You'll have to wait for a new release (or run from the development version) to see the change.

It's currently targeted for 5.0 because it's a new feature - look at the right hand side of this issue page. But it's probably small enough that we could put it in a 4.x release. @minrk ?

[elmerehbi]

@takluyver Great. Thanks for the clarification.

[jdfreder]

But it's probably small enough that we could put it in a 4.x release. @minrk ?

I think new features can get into minor releases. It's only features that change existing behavior that cannot. The key binding used here wasn't already in use. I guess it's debatable though, because users may have it bound now (although I think user config would overwrite it regardless).