Fix issues from API review for 8.2 (#10342)

* Rename HierarchicalDataCommunicator#getMapper to getHierarchyMapper

* Make rpc field in Notification private

* Change DropIndexCalculator.ALWAYS_DROP_TO_END to a generic static method

* Move EditorImpl#editRow documentation to the interface level

* Correct GridDragEndEvent, GridDragStartEvent constructor javadocs

* Revert SharedState.registeredEventListeners to a Set

* Rename GridDropTarget dropAllowedOnSortedGridRows

* Rename ColumnState.contentMode to tooltipContentMode

3 files changed, 13 insertions, 26 deletions

diff --git a/shared/src/main/java/com/vaadin/shared/communication/SharedState.java b/shared/src/main/java/com/vaadin/shared/communication/SharedState.java
index 872327e8fd..fd9a3ce0bd 100644
--- a/shared/src/main/java/com/vaadin/shared/communication/SharedState.java
+++ b/shared/src/main/java/com/vaadin/shared/communication/SharedState.java
@@ -19,6 +19,7 @@ package com.vaadin.shared.communication;
 import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 import com.vaadin.shared.Connector;
 import com.vaadin.shared.annotations.NoLayout;
@@ -63,12 +64,9 @@ public class SharedState implements Serializable {
     public boolean enabled = true;
 
     /**
-     * A Map of event identifiers with registered listeners, {@code key} is
-     * event identifier, {@code value} is the listeners count.
-     *
-     * @since 8.2
+     * A set of event identifiers with registered listeners.
      */
     @NoLayout
-    public Map<String, Integer> registeredEventListeners;
+    public Set<String> registeredEventListeners;
 
 }
diff --git a/shared/src/main/java/com/vaadin/shared/ui/ComponentStateUtil.java b/shared/src/main/java/com/vaadin/shared/ui/ComponentStateUtil.java
index a2f6618b9e..0ef247353b 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/ComponentStateUtil.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/ComponentStateUtil.java
@@ -16,7 +16,7 @@
 package com.vaadin.shared.ui;
 
 import java.io.Serializable;
-import java.util.HashMap;
+import java.util.HashSet;
 
 import com.vaadin.shared.AbstractComponentState;
 import com.vaadin.shared.Registration;
@@ -67,19 +67,12 @@ public final class ComponentStateUtil implements Serializable {
     @Deprecated
     public static final void removeRegisteredEventListener(SharedState state,
             String eventIdentifier) {
-        if (state.registeredEventListeners != null) {
-            Integer count = state.registeredEventListeners.get(eventIdentifier);
-            if (count != null) {
-                if (count > 1) {
-                    state.registeredEventListeners.put(eventIdentifier,
-                            count - 1);
-                } else {
-                    state.registeredEventListeners.remove(eventIdentifier);
-                    if (state.registeredEventListeners.isEmpty()) {
-                        state.registeredEventListeners = null;
-                    }
-                }
-            }
+        if (state.registeredEventListeners == null) {
+            return;
+        }
+        state.registeredEventListeners.remove(eventIdentifier);
+        if (state.registeredEventListeners.size() == 0) {
+            state.registeredEventListeners = null;
         }
     }
 
@@ -94,13 +87,9 @@ public final class ComponentStateUtil implements Serializable {
     public static final Registration addRegisteredEventListener(
             SharedState state, String eventListenerId) {
         if (state.registeredEventListeners == null) {
-            state.registeredEventListeners = new HashMap<>();
-        }
-        Integer count = state.registeredEventListeners.get(eventListenerId);
-        if (count == null) {
-            count = 0;
+            state.registeredEventListeners = new HashSet<>();
         }
-        state.registeredEventListeners.put(eventListenerId, count + 1);
+        state.registeredEventListeners.add(eventListenerId);
         return () -> removeRegisteredEventListener(state, eventListenerId);
     }
 }
diff --git a/shared/src/main/java/com/vaadin/shared/ui/grid/ColumnState.java b/shared/src/main/java/com/vaadin/shared/ui/grid/ColumnState.java
index eb0e28dce9..652db0c1bf 100644
--- a/shared/src/main/java/com/vaadin/shared/ui/grid/ColumnState.java
+++ b/shared/src/main/java/com/vaadin/shared/ui/grid/ColumnState.java
@@ -80,6 +80,6 @@ public class ColumnState extends AbstractGridExtensionState {
      *
      * @since 8.2
      */
-    public ContentMode contentMode;
+    public ContentMode tooltipContentMode;
 
 }