Date Picker Calendar Grids: Fix color contrast for selected date

[carmacleod]

Closes #1478

This just implements the simplest possible fix for issue #1478
@jongund, please let me know if you like it, or if you would prefer to fix the issue some other way.

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View example in compare branch using RawGitHack

[carmacleod]

Thanks, @jongund ! I'll do the same thing for DatePicker Combobox, then.

[carmacleod]

Ok, I fixed up combobox datepicker selected date color as well.

Note that for some reason, I also had to delete the following line (in addition to changing the colors for [tabindex="0"] ):

.combobox-datepicker .dates td:focus,

I don't know why I didn't have to delete the :focus line in the datepicker dialog.

Can you make sure I didn't mess something up? I've tested both, and they seem ok to me, but maybe I missed something.

[jongund]

@carmacleod

I think we still need the :focus selector, but I will test.

[jongund]

@carmacleod

Couple things I found in testing:

• I think the background color makes the date with tabindex=0 stand out alot like it has focus. I think the background should be a little more subtle.
• In high contrast mode on Windows we do not have a visual indicator of the current date with tabindex=0 when focus is on another control in the dialog, this is a bug in the current picker dialog, too. Is this something you could work on?

[mcking65]

@carmacleod , based on Jon's last comment, it seems there's a little more to do here?

[mcking65]

Per discussion in today's meeting, this is ready to merge.