Notebook focus effects

[juhasch]

When I click outside of a notebook and then back onto it, I can generate interesting effects.

1. First cell is in edit mode. I click on something outside of the web browser window, so the cell looses focus. Now clicking at some free space within the notwbook window (not on a cell area) leaves the cell in command mode + displays a text cursor:
   
2. Clicking on another cell instead (not on the codemirror edit field, e.g. on the In [] text) still displays a cursor at the previously selected cell:
   

This happens using Firefox 26, not with Chrome and with latest master on Windows as well as Linux.

On Windows only, I can also create jumping selection boxes. In this case the selection jumps between two cells without me doing anything. Github does not let me upload a video, so I can't show that.

[ellisonbg]

I have tested this on FF + C on OS X and cannot reproduce this behavior. Can you clear your browser cache, pull the latest master, run git submodule update in the top of the repo and retry.

Also, will need help verifying from others running Windows and Linux.

[juhasch]

I tested it today on another PC with master from 23. of January and I didn't see the issue. Updated to today's master and I could reproduce the behavior.
As always, cache cleared, submodules updated, no extensions loaded.

[juhasch]

It looks like this change is causing the behavior I experience:
a759238

[ellisonbg]

@jdfreder could you look at this one on Windows?

[juhasch]

This is the same for me on Linux and only happens with Firefox.

[jdfreder]

I am able to consistently replicate #.1 on FF 26.0. To clarify, this is exactly what I did (borrowing from @juhasch 's instructions, but adding some details).

• Create a notebook with a single cell. Enter edit mode on the first cell by clicking on it. Click on a window other than the web browser window, so the cell looses focus. Now, and this important, click on the whitespace to the left of the cell (outside of it's grey border). Originally I thought that I could click somewhere in the header, or on the window title bar, but neither of those worked.

[jdfreder]

I'm also able to consistently replicate #.2 on FF 26.0.

• Create a notebook with two cells. Enter edit mode on the first cell by clicking on it. Click on a window other than the web browser window, so the cell looses focus. Now, and this important, click on the prompt of the second cell.

[jdfreder]

However, I haven't been able to replicate the jumping box bug yet (on Windows or Linux).

[jdfreder]

I'm working on fixing this with #5146