TRANSPARENT value violates WMS standard

[ahocevar]

The WMS standard (confirmed for 1.1.1 and 1.3.0) demands that the TRANSPARENT param has two valid values, "TRUE" and "FALSE". OpenLayers uses "true" and "false".

From the WMS 1.1.1 spec:

6.4.1 Parameter Ordering and Case

Parameter names shall not be case sensitive, but parameter values shall be case sensitive. In this document, parameter names are typically shown in uppercase for typographical clarity, not as a requirement.

7.2.3.9 TRANSPARENT

The optional TRANSPARENT parameter specifies whether the map background is to be made transparent or not. TRANSPARENT can take on two values, "TRUE" or "FALSE". The default value is FALSE if this parameter is absent from the request.

[ahocevar]

The attached patch fixes the issue. The change only applies to cases where the TRANSPARENT param is provided as boolean value.

Patch with tests; all tests pass in Safari5. Thanks for any review.

[bartvde]

Thanks for finally tackling this Andreas, please commit.

Btw, I think it's a safe change for 2.11 (I don't know if 2.11 has been branched already).

[ahocevar]

(In [11984]) making TRANSPARENT param values all UPPERCASE to conform to the WMS spec. r=bartvde (closes #3304)