Warning rebinding DragClientBundle - encountered '=' was expecting...

[GoogleCodeExporter]

Hi Allan,

I'm getting the following warning, not sure if it's even a bug or not.
It happens in Quirks mode at least.
I'm using GWT 2.6.1 and gwt-dnd 3.3.3
This is on Mac (Mavericks) running in Eclipse Development mode
Using Firefox 26

[DEBUG] [ycpapp] - Rebinding 
com.allen_sauer.gwt.dnd.client.util.DragClientBundle
    [DEBUG] [ycpapp] - Invoking generator com.google.gwt.resources.rebind.context.InlineClientBundleGenerator
        [DEBUG] [ycpapp] - Preparing method css
            [INFO] [ycpapp] - The following problems were detected
                [WARN] [ycpapp] - Line 63 column 30: encountered "=". Was expecting one of: "+" "-" "," "/" ")" <STRING> <IDENT> <NUMBER> <URL> <PERCENTAGE> <PT> <MM> <CM> <PC> <IN> <PX> <EMS> <EXS> <DEG> <RAD> <GRAD> <MS> <SECOND> <HZ> <KHZ> <DIMEN> <HASH> <UNICODERANGE> <FUNCTION> 

Original issue reported on code.google.com by martijn....@gmail.com on 8 Dec 2014 at 10:29

[norbertroamsys]

The line
https://github.com/fredsa/gwt-dnd/blob/master/DragDrop/src/com/allen_sauer/gwt/dnd/client/util/gwt-dnd.css#L63: filter: alpha(opacity = 30)
causes the problem. It seems to be a weakness of the GWT Resource Parser because it should be valid CSS.
Am I right by saying that it is only needed for IE support?
If true the best solution may be to remove the alpha style.
Can this be done? Would be nice!

[fredsa]

Right, that alpha filter for there IE only.

It looks like IE8 and below only support alpha filter. Once we get to IE9+ targets we could drop it.

[mcimbora]

It should be enough to wrap the alpha inside literal [1] function, i.e. filter: literal("alpha(opacity = 30)")

[1] http://www.gwtproject.org/doc/latest/DevGuideClientBundle.html#Literal_function