Fix left/right margin issues with dual-panel calendars

[andrewnicols]

No description provided.

[yahoocla]

CLA is valid!

[andrewnicols]

LTR:

RTL at present state of dev-3.x:

RTL with the applied change:

[andrewnicols]

Build failing due to travis-ci/travis-ci#2076

[tilomitra]

We should pull this in before 3.16.0 GA IMO. Reviewers, could you take a look at this?

[tilomitra]

@andrewnicols What's the test page that you're using to test this? Can you put the HTML up somewhere?

[triptych]

I don't think this is a release blocker, however it should definitely go into dev-3.x for next release.

[andrewnicols]

@tilomitra I'm testing with the two-pane calendar example in the build docs. E.g. the local equivalent of http://yuilibrary.com/yui/docs/calendar/calendar-multipane.html

Note: the one on yuilibrary.com isn't the best example for all of these issues (though it does exhibit this bug) because of the inclusion of CSS Grids from 3.9.0 instead of the relevant release (raised in #1712).

[okuryu]

I think that it is ok to merge, but this is just an enhancement not release blocker.

[ezequiel]

Thanks.

[triptych]

In the future, please include HISTORY.md updates in your PR @andrewnicols