Use the progress monitoring API appropriately.

- A method should call Submonitor.convert(..) upon receiving its monitor
  in order to correctly allocate its share of the work to be done
- Fixes eclipse-jdtls#1722

Signed-off-by: Roland Grunberg <rgrunber@redhat.com>

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/CallHierarchyHandler.java

@@ -29,6 +29,7 @@
 import org.eclipse.core.runtime.Assert;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
+import org.eclipse.core.runtime.SubMonitor;
 import org.eclipse.jdt.core.IClassFile;
 import org.eclipse.jdt.core.ICodeAssist;
 import org.eclipse.jdt.core.ICompilationUnit;
@@ -166,7 +167,8 @@ private IMember getCallHierarchyElement(String uri, int line, int character, IPr
 	}
 
 	private List<CallHierarchyIncomingCall> getIncomingCallItemsAt(String uri, int line, int character, IProgressMonitor monitor) throws JavaModelException {
-		IMember candidate = getCallHierarchyElement(uri, line, character, monitor);
+		SubMonitor sub = SubMonitor.convert(monitor, 2);
+		IMember candidate = getCallHierarchyElement(uri, line, character, sub.split(1));
 		if (candidate == null) {
 			return null;
 		}
@@ -179,7 +181,7 @@ private List<CallHierarchyIncomingCall> getIncomingCallItemsAt(String uri, int l
 			return null;
 		}
 
-		MethodWrapper[] calls = wrapper.getCalls(monitor);
+		MethodWrapper[] calls = wrapper.getCalls(sub.split(1));
 		if (calls == null) {
 			return null;
 		}
@@ -199,7 +201,8 @@ private List<CallHierarchyIncomingCall> getIncomingCallItemsAt(String uri, int l
 	}
 
 	private List<CallHierarchyOutgoingCall> getOutgoingCallItemsAt(String uri, int line, int character, IProgressMonitor monitor) throws JavaModelException {
-		IMember candidate = getCallHierarchyElement(uri, line, character, monitor);
+		SubMonitor sub = SubMonitor.convert(monitor, 2);
+		IMember candidate = getCallHierarchyElement(uri, line, character, sub.split(1));
 		if (candidate == null) {
 			return null;
 		}
@@ -211,7 +214,7 @@ private List<CallHierarchyOutgoingCall> getOutgoingCallItemsAt(String uri, int l
 			return null;
 		}
 
-		MethodWrapper[] calls = wrapper.getCalls(monitor);
+		MethodWrapper[] calls = wrapper.getCalls(sub.split(1));
 		if (calls == null) {
 			return null;
 		}