fix random startup notification "Insufficient dependencies for Gerrit…

… plugin"

see: https://intellij-support.jetbrains.com/hc/en-us/community/posts/115000667650-

fixes issue #292

src/main/java/com/urswolfer/intellij/plugin/gerrit/ui/GerritToolWindow.java

@@ -25,10 +25,13 @@
 import com.intellij.openapi.actionSystem.Constraints;
 import com.intellij.openapi.actionSystem.DefaultActionGroup;
 import com.intellij.openapi.actionSystem.Separator;
+import com.intellij.openapi.application.ApplicationManager;
 import com.intellij.openapi.diagnostic.Logger;
 import com.intellij.openapi.diff.DiffManager;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.ui.SimpleToolWindowPanel;
+import com.intellij.openapi.vcs.ProjectLevelVcsManager;
+import com.intellij.openapi.vcs.VcsListener;
 import com.intellij.openapi.vcs.changes.committed.RepositoryChangesBrowser;
 import com.intellij.ui.IdeBorderFactory;
 import com.intellij.ui.JBSplitter;
@@ -40,8 +43,12 @@
 import com.urswolfer.intellij.plugin.gerrit.ui.diff.CommentsDiffTool;
 import com.urswolfer.intellij.plugin.gerrit.ui.filter.ChangesFilter;
 import com.urswolfer.intellij.plugin.gerrit.ui.filter.GerritChangesFilters;
+import git4idea.GitUtil;
+import git4idea.repo.GitRepository;
+import git4idea.repo.GitRepositoryManager;
 
 import javax.swing.*;
+import java.util.List;
 import java.util.Observable;
 import java.util.Observer;
 
@@ -107,13 +114,39 @@ public void consume(ChangeInfo changeInfo) {
 
         panel.setContent(horizontalSplitter);
 
-        reloadChanges(project, false);
+        List<GitRepository> repositories = GitUtil.getRepositoryManager(project).getRepositories();
+        if (!repositories.isEmpty()) {
+            reloadChanges(project, false);
+        }
+
+        registerVcsChangeListener(project);
 
         changeListPanel.showSetupHintWhenRequired(project);
 
         return panel;
     }
 
+    private void registerVcsChangeListener(final Project project) {
+        VcsListener vcsListener = new VcsListener() {
+            @Override
+            public void directoryMappingChanged() {
+                forceGitRepositoryMappingInit(project);
+            }
+        };
+        project.getMessageBus().connect().subscribe(ProjectLevelVcsManager.VCS_CONFIGURATION_CHANGED, vcsListener);
+    }
+
+    private void forceGitRepositoryMappingInit(final Project project) {
+        ApplicationManager.getApplication().invokeLater(new Runnable() {
+            @Override
+            public void run() {
+                GitRepositoryManager repositoryManager = GitUtil.getRepositoryManager(project);
+                repositoryManager.getRepositoryForRoot(project.getBaseDir());
+                reloadChanges(project, false);
+            }
+        });
+    }
+
     private void changeSelected(ChangeInfo changeInfo, final Project project) {
         gerritUtil.getChangeDetails(changeInfo._number, project, new Consumer<ChangeInfo>() {
             @Override