help ID for SessionDialog (IDEA-64910)

platform/vcs-api/src/com/intellij/openapi/vcs/changes/CommitSession.java

@@ -43,6 +43,11 @@ public interface CommitSession {
 
     public void executionCanceled() {
     }
+
+    @Override
+    public String getHelpId() {
+      return null;
+    }
   };
 
   /**
@@ -57,4 +62,10 @@ public interface CommitSession {
   boolean canExecute(Collection<Change> changes, String commitMessage);
   void execute(Collection<Change> changes, String commitMessage);
   void executionCanceled();
+
+  /**
+   * @return the ID of the help topic to show for the dialog
+   * @since 10.5
+   */
+  String getHelpId();
 }

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/patch/CreatePatchCommitExecutor.java

@@ -198,5 +198,10 @@ public class CreatePatchCommitExecutor implements CommitExecutorWithHelp, Projec
 
     public void executionCanceled() {
     }
+
+    @Override
+    public String getHelpId() {
+      return null;
+    }
   }
 }

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/shelf/ShelveChangesCommitExecutor.java

@@ -112,5 +112,10 @@ public class ShelveChangesCommitExecutor implements CommitExecutorWithHelp {
 
     public void executionCanceled() {
     }
+
+    @Override
+    public String getHelpId() {
+      return null;
+    }
   }
 }

platform/vcs-impl/src/com/intellij/openapi/vcs/changes/ui/SessionDialog.java

@@ -85,4 +85,14 @@ public class SessionDialog extends DialogWrapper {
     super.dispose();
     myOKButtonUpdateAlarm.cancelAllRequests();
   }
+
+  @Override
+  protected String getHelpId() {
+    try {
+      return mySession.getHelpId();
+    }
+    catch (AbstractMethodError e) {
+      return null;
+    }
+  }
 }