[Users] GeoExt layer opacity slider and IE8

[David Miller]

Good day!  This may an OpenLayers issue and I did find some discussion about
opacity problems with IE8.  But, I thought I'd post here in case anyone had
any suggestions.  I have an Opacity Layer slider in a tree panel for my
overlay layers.  One of these is a vector layer.  The layer's opacity
changes in Firefox and IE9, but not IE8.  You can view this behavior at:

http://www.mdl.nws.noaa.gov/wxmap/wxmapHourlyDay_test.php

Just to note that things are slow to change in IE8 due to use of VML (vs SVG
used in Firefox).  If you click off the NDFD graphic checkbox in both
browsers for a comparison, you can see what's happening (or not).

I tried a patch listed in the OL code ticket discussion, but they backed
that out for version 2.12 work.  Still gave it a try though without
success.  One thing I did note is that the opacity value does change in the
IE Developer Tools debugger.  It just doesn't change on the browser itself.

The only other workaround I was thinking of was setting the layer opacity
value in each of the vector layer features before I call a redraw.  But I
thought that might be a bit much.  And of course, as IE9 gains more
acceptance, this won't matter before long anyway.

Thanks for any suggestions!

Dave Miller
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