add a workaround for double url encoded + in the resources path

modules/core/shared/src/main/scala-3/dumbo/ResourceFilePath.scala

@@ -27,7 +27,20 @@ object ResourceFilePath:
           val srcUriStr   = head.toURI().toString()
           val jarFilePath = srcUriStr.slice(srcUriStr.lastIndexOf(":") + 1, srcUriStr.lastIndexOf("!"))
 
-          val resources = scala.util.Using.resource(java.util.zip.ZipFile(jarFilePath)) { fs =>
+          def openJar(path: String) = try {
+            java.util.zip.ZipFile(jarFilePath)
+          } catch {
+            case _: Throwable =>
+              // another attempt as a (hopefully temporary) workaround in case a path got URL encoded twice
+              // e.g. a common SNAPSHOT version may contain a '+' sign and look like 'my-lib-0.0.0+123-456-SNAPSHOT'
+              // it seems to end up URL encoded on the file system (at least via coursier) and look like that "my-lib-0.0.0%2B123-456-SNAPSHOT.jar"
+              // on getting the URL via getResources() the path is URL encoded again and becomes: "my-lib-0.0.0%252B123-456-SNAPSHOT.jar"
+              // not sure yet which side would need to fix that, for now this gets it working
+              // helps only with a double encoded `+` sign which may be commonly used in snapshot versions
+              java.util.zip.ZipFile(jarFilePath.replace("%252B", "%2B"))
+          }
+
+          val resources = scala.util.Using.resource(openJar(jarFilePath)) { fs =>
             fs
               .entries()
               .asScala