[regression] Toolbar: disabled buttons not indicated

[bill]

In the editor on safari, previously disabled cut/paste buttons showed up as a "washed-out" looking image, less bright/contrasted than the enabled state. The don't seem to any more.

There seems to be more than one problem (perhaps an issue w/ToolBar itself too?) because on FF3 even in the 1.1 release the button didn't show up as disabled.

In trunk, since indent/outdent are disabled except for lists, then should show up grayed out.

[bill]

Due to my change in [13650]. Normal buttons indicate disabled-ness by changing the text color from black to gray but that doesn't work for toolbar buttons since they don't have text, just an icon.

I changed the button to not use transparency because it was making the button itself transparent and the page background was bleeding through... although not sure why we can't just make the image semi-transparent. Perhaps because of browser bugs?

[bill]

Given problems like #7371 I don't think it's wise to use opacity settings unless necessary; I'll fix this bug by creating disabled versions of the editor icons.

[nonken]

(In [15268]) Added disabled editor icons, refs #7333

[bill]

(In [15271]) Fixes #7333: disabled editor toolbar buttons should look disabled (ie, washed out), like other toolbars.

[bill]

(In [15272]) Make disabled editor icons black & white, to further differentiate between enabled and disabled modes. Refs #7333