add keyboard shortcut for toggling run paragraph

[TYMichaelChen]

What is this PR for?

Added a keyboard shortcut to toggle enable/disable of running a paragraph

What type of PR is it?

Improvement

Todos

Is there a relevant Jira issue?

https://issues.apache.org/jira/browse/ZEPPELIN-608

How should this be tested?

Click in paragraph and press ctrl+alt+s

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? no
• Is there breaking changes for older versions? no
• Does this needs documentation? no

[Leemoonsoo]

It's not been merged yet but checkpoint feature is working in progress at #577. How about keep Ctrl-Alt-s for the checkpoint? Ipython/Jupyter also uses 's' for save/checkpoint.

[TYMichaelChen]

@Leemoonsoo- gotcha. that makes sense. how about ctrl+alt+r? I changed it in the newest update, but open to other shortcut keys too.

[felixcheung]

+1 on ctrl-alt-r
btw, should we have these mapping for Mac (doesn't have alt key)

[Leemoonsoo]

ctrl+alt+r.
Looks good to me.

on osx, option key works instead of alt key.

[TYMichaelChen]

yup. on mac option works for alt. Should we have a line on the keyboard-shortcut modal to clarify that alt can be replaced by option on macs?

[Leemoonsoo]

Yes, if we have a line for using option key on macs, that definitely would help

[felixcheung]

is it possible show different key name in the shortcut list based on the platform the user is on? this could be a separate PR.

Merging this if there is no more discussion.

[TYMichaelChen]

@felixcheung : good suggestion on the shortcut list. Thanks. I opened a separate PR for it here: #665