debugging IDEA-127750 (Sometimes find in path is working after second invocation only)

* Show a separate balloon when the usage search is canceled (instead of '0 usages found')
* Add debug logging

platform/lang-impl/src/com/intellij/find/impl/FindInProjectTask.java

@@ -128,6 +128,9 @@ class FindInProjectTask {
         }
       });
       myProgress.setIndeterminate(false);
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Searching for " + myFindModel.getStringToFind() + " in " + filesForFastWordSearch.size() + " indexed files");
+      }
 
       searchInFiles(filesForFastWordSearch, processPresentation, consumer);
 
@@ -137,6 +140,10 @@ class FindInProjectTask {
       final Collection<PsiFile> otherFiles = collectFilesInScope(filesForFastWordSearch, skipIndexed);
       myProgress.setIndeterminate(false);
 
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Searching for " + myFindModel.getStringToFind() + " in " + otherFiles.size() + " non-indexed files");
+      }
+
       long start = System.currentTimeMillis();
       searchInFiles(otherFiles, processPresentation, consumer);
       if (skipIndexed && otherFiles.size() > 1000) {
@@ -144,7 +151,10 @@ class FindInProjectTask {
       }
     }
     catch (ProcessCanceledException e) {
-      // fine
+      processPresentation.setCanceled(true);
+      if (LOG.isDebugEnabled()) {
+        LOG.debug("Usage search canceled", e);
+      }
     }
 
     if (!myLargeFiles.isEmpty()) {

platform/usageView/src/com/intellij/usages/FindUsagesProcessPresentation.java

@@ -43,6 +43,7 @@ public class FindUsagesProcessPresentation {
   private Collection<PsiFile> myLargeFiles;
   private boolean myShowFindOptionsPrompt = true;
   private Runnable mySearchWithProjectFiles;
+  private boolean myCanceled;
 
   public FindUsagesProcessPresentation(@NotNull UsageViewPresentation presentation) {
     myUsageViewPresentation = presentation;
@@ -112,6 +113,15 @@ public class FindUsagesProcessPresentation {
   public void setShowFindOptionsPrompt(boolean showFindOptionsPrompt) {
     myShowFindOptionsPrompt = showFindOptionsPrompt;
   }
+
+
+  public void setCanceled(boolean canceled) {
+    myCanceled = canceled;
+  }
+
+  public boolean isCanceled() {
+    return myCanceled;
+  }
 }
 
 

platform/usageView/src/com/intellij/usages/impl/SearchForUsagesRunnable.java

@@ -122,7 +122,7 @@ class SearchForUsagesRunnable implements Runnable {
     return "<a href='" + SEARCH_IN_PROJECT_HREF_TARGET + "'>Search in Project</a>";
   }
 
-  private static void notifyByFindBalloon(final HyperlinkListener listener,
+  private static void notifyByFindBalloon(@Nullable final HyperlinkListener listener,
                                           @NotNull final MessageType info,
                                           @NotNull FindUsagesProcessPresentation processPresentation,
                                           @NotNull final Project project,
@@ -400,6 +400,12 @@ class SearchForUsagesRunnable implements Runnable {
       ApplicationManager.getApplication().invokeLater(new Runnable() {
           @Override
           public void run() {
+            if (myProcessPresentation.isCanceled()) {
+              notifyByFindBalloon(null, MessageType.WARNING, myProcessPresentation, myProject, Arrays.asList("Usage search was canceled"));
+              findStartedBalloonShown.set(false);
+              return;
+            }
+
             final List<Action> notFoundActions = myProcessPresentation.getNotFoundActions();
             final String message = UsageViewBundle.message("dialog.no.usages.found.in",
                                                            StringUtil.decapitalize(myPresentation.getUsagesString()),