IDEA-70721 Mercurial push consistently shows 'Nothing to push' notification even if changes were pushed

*When we push changesets we need to analyze all subrepositories. If one repo doesn't have any changes, the others may have.  "Nothing to push" may relate only to one repository.

plugins/hg4idea/src/org/zmlx/hg4idea/HgPusher.java

@@ -49,14 +49,11 @@ public class HgPusher {
 
   private static final Logger LOG = Logger.getInstance(HgPusher.class);
   private static Pattern PUSH_COMMITS_PATTERN = Pattern.compile(".*added (\\d+) changesets.*");
-  private static Pattern PUSH_NO_CHANGES = Pattern.compile(".*no changes found.*");
 
   private final Project myProject;
-  private final ProjectLevelVcsManager myVcsManager;
 
   public HgPusher(Project project) {
     myProject = project;
-    myVcsManager = ProjectLevelVcsManager.getInstance(project);
   }
 
   public void showDialogAndPush() {
@@ -141,6 +138,7 @@ public class HgPusher {
   }
 
   private static int getNumberOfPushedCommits(HgCommandResult result) {
+    int numberOfCommitsInAllSubrepos = 0;
     if (!HgErrorUtil.isAbort(result)) {
       final List<String> outputLines = result.getOutputLines();
       for (String outputLine : outputLines) {
@@ -148,16 +146,15 @@ public class HgPusher {
         final Matcher matcher = PUSH_COMMITS_PATTERN.matcher(outputLine);
         if (matcher.matches()) {
           try {
-            return Integer.parseInt(matcher.group(1));
+            numberOfCommitsInAllSubrepos += Integer.parseInt(matcher.group(1));
           }
           catch (NumberFormatException e) {
             LOG.info("getNumberOfPushedCommits ", e);
             return -1;
           }
-        } else if (PUSH_NO_CHANGES.matcher(outputLine).matches()) {
-          return 0;
         }
       }
+      return numberOfCommitsInAllSubrepos;
     }
     return -1;
   }