Added new menu option under 'Help' for Keyboard-Shortcuts.

[alekhgupta1441]

Fixes #3148

Included keyboard shortcuts in 'Help' menu.

[devnulling]

@alekhgupta1441 thanks for the PR.

A few things:

1. we will need a CLA from you.

https://github.com/gnuradio/gnuradio/blob/master/CONTRIBUTING.md
https://wiki.gnuradio.org/index.php/Development#What.27s_this_Copyright_Assignment.3F

In order to get the process rolling, please email "bhilburn AT gnuradio.org" for a form to start the copyright process.

2. You should only have a single commit for this change, you will need to squash the multiple commits into one.

3. This change adds a little bit too much text to that display, so on smaller screens, like what you have a screen shot of, the "close" menu will not be displayed.

i think it would be better to add a new menu option under "Help" such as "Keyboard Shortcuts" that would open up a different alert/popup window, where this info would be at.

[devnulling]

One more request, the commit message should prefix the section of code that it changes for example:

grc: Extend the help menu

[alekhgupta1441]

I have mailed for CLA prcoess.
And i will soon update this pr with requested changes.

[michaelld]

LGTM

[777arc]

Sounds like @alekhgupta1441 wants to update it to address the small screen size issue, and we're also waiting on the CLA, but should be good to go after that.

[alekhgupta1441]

Sorry, for being quite late.
I have updated the PR with requested changes.
And got CLA processed.

[alekhgupta1441]

New menu screenshot.
Ctrl+K is short-cut to this menu.

CLA is signed.

[alekhgupta1441]

@michaelld,@marcusmueller,@devnulling, @777arc can you please review this?

[777arc]

@alekhgupta1441 I don't see the keyboard shortcuts menu, is it supposed to be listed under Help? Control-K doesn't do anything for me either.

-Marc

[alekhgupta1441]

@777arc Yes, Keys menu option is under 'Help' and CTRL +K opens Keyboard Shortcuts menu.I checked it again by building gnuradio from branch alekh_gr.

[alekhgupta1441]

Keys menu.

[777arc]

Oops had PYTHONPATH issues. Yeah looks good!

[nickoe]

Looks safe to me.

[michaelld]

LGTM

[michaelld]

All looks good here: CLA; multiple approvals; relatively simple And useful addition. Merging.

[alekhgupta1441]

@777arc , @michaelld, @nickoe Thanks for Reviewing and Merging PR.

[nickoe]

@michaelld @alekhgupta1441 @marcusmueller Do we want this on maint-3.8 as well, or should we ignore that?

[nickoe]

I just tested this as a cherry-pick on maint-3.8 and it seem to work well. But this is only testing with python3.