Opaque background on side nav flyout pointer

[conceptfusion]

In the side navigation fly-out menus the parent menu item's grey pointer image has a non-transparent white background that blocks the sub-menu's pale blue background hover colour.

Screenshot

Screenshot (Blue admin theme)

It get's worse when using the blue admin theme (see second attachment).

Hi all

Here is a zip with the the start of the changes this all works LTR I haven't done the RTL css (got to work how to flip it and to tell which way round it is).

I have may have broken the RTL css

The images will need a adjusting to improve the boarders

zip of patch

pbeare, can you add a real patch? Take a look at ​http://codex.wordpress.org/Reporting_Bugs#Patching_Bugs.

This was introduced in [18901]. For the main flyouts ticket, see #18382.

In [18942]:

Create admin menu arrows using CSS3 transforms. props chexee. see #18382, fixes #18902.