Added tri-state checkboxes for groups and changing caret-container icon

[oltur]

No description provided.

[S-t-e-p-s]

why do you push useless changes? spaces, It is really hard to review it. :(
Try to review your changes and you will get my point.
Title of your PR got my attention, I also need this thing, but it's really hard to understand what was changed.

[oltur]

Hi,

Sorry for that, it was an autoformatting from Visual Studio I hadn't time
to revert.
Hoped you could autoformat it back and it could be useful.

---

Yours faithfully,
Alex Turevski

On Fri, Nov 11, 2016 at 3:16 PM, Stepan Tynskyi notifications@github.com
wrote:

why do you push useless changes? spaces It is really hard to review it.
:(
Try to review your changes and you will get my point.

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[davidstutz]

Agree with @S-t-e-p-s. Thanks anyway, any contribution is appreciated.

I am also missing a description. I can't really see what issue this PR fixes or which feature it adds.

[dten]

As someone who was looking for this feature I can tell what it's supposed to do

If you have a group with some but not all of its elements selected the group checkbox will show indeterminate so that when it's collapsed you can tell it has something inside ticked