Deduplicate stored launch configs of nested projects eclipse-platform…

…#798

Fixes eclipse-platform#798.

m2e projects can be nested (e.g. modules stored inside a reactor).
Launch configs stored the inner nested projects appear twice, because
they are not equal with the old implementation checking only name and
container. Therefore also check the resolved location if the containers
are different.

I've tested this with an m2e IDE containing such nested projects and
stored launch configs. The duplicates are gone with the change.

debug/org.eclipse.debug.core/core/org/eclipse/debug/internal/core/LaunchConfiguration.java

@@ -369,7 +369,7 @@ public boolean equals(Object object) {
 			LaunchConfiguration config = (LaunchConfiguration) object;
 			if (!config.isWorkingCopy()) {
 				return getName().equals(config.getName()) &&
-					equalOrNull(getContainer(), config.getContainer());
+						(equalOrNull(getContainer(), config.getContainer()) || equalOrNull(getLocation(), config.getLocation()));
 			}
 		}
 		return false;
@@ -651,11 +651,15 @@ public ILaunchConfigurationWorkingCopy getWorkingCopy() throws CoreException {
 	@Override
 	public int hashCode() {
 		IContainer container = getContainer();
-		if (container == null) {
-			return getName().hashCode();
-		} else {
-			return getName().hashCode() + container.hashCode();
+		int result = getName().hashCode();
+		if (container != null) {
+			result += container.hashCode();
+		}
+		IPath location = getLocation();
+		if (location != null) {
+			result += location.hashCode();
 		}
+		return result;
 	}
 
 	@Override