GUI: Don't warn about empty results after re-check.

If user tried to save results after re-checking files and not
getting new results by the re-check, the save was failed since
Cppcheck thought there were no results. This was caused by wrong
clearing of "has results" flag when removing single items from
the results.

Ticket: #4121 (Bogus error message when saving the report)

gui/mainwindow.cpp

@@ -301,7 +301,7 @@ void MainWindow::DoCheckFiles(const QStringList &files)
         pathList.AddExcludeList(mProject->GetProjectFile()->GetExcludedPaths());
     QStringList fileNames = pathList.GetFileList();
 
-    mUI.mResults->Clear();
+    mUI.mResults->Clear(true);
     mThread->ClearFiles();
 
     if (fileNames.isEmpty()) {
@@ -586,6 +586,9 @@ void MainWindow::ReCheck()
     if (files.empty())
         return;
 
+    // Clear details, statistics and progress
+    mUI.mResults->Clear(false);
+
     // Clear results for changed files
     for (int i = 0; i < files.size(); ++i)
         mUI.mResults->Clear(files[i]);
@@ -601,7 +604,7 @@ void MainWindow::ReCheck()
 
 void MainWindow::ClearResults()
 {
-    mUI.mResults->Clear();
+    mUI.mResults->Clear(true);
     mUI.mActionClearResults->setEnabled(false);
     mUI.mActionSave->setEnabled(false);
 }
@@ -634,7 +637,7 @@ void MainWindow::OpenXML()
                            &selectedFilter);
 
     if (!selectedFile.isEmpty()) {
-        mUI.mResults->Clear();
+        mUI.mResults->Clear(true);
         mUI.mResults->ReadErrorsXml(selectedFile);
     }
 }

gui/resultsview.cpp

@@ -67,11 +67,15 @@ ResultsView::~ResultsView()
     //dtor
 }
 
-void ResultsView::Clear()
+void ResultsView::Clear(bool results)
 {
-    mUI.mTree->Clear();
+    if (results) {
+        mUI.mTree->Clear();
+        mErrorsFound = false;
+    }
+
     mUI.mDetails->setText("");
-    mErrorsFound = false;
+
     mStatistics->Clear();
 
     //Clear the progressbar
@@ -83,14 +87,13 @@ void ResultsView::Clear()
 void ResultsView::Clear(const QString &filename)
 {
     mUI.mTree->Clear(filename);
-    mUI.mDetails->setText("");
-    mErrorsFound = false;
-    mStatistics->Clear();
 
-    // Clear the progressbar
-    mUI.mProgress->setMaximum(PROGRESS_MAX);
-    mUI.mProgress->setValue(0);
-    mUI.mProgress->setFormat("%p%");
+    /**
+     * @todo Optimize this.. It is inefficient to check this every time.
+     */
+    // If the results list got empty..
+    if (!mUI.mTree->HasResults())
+        mErrorsFound = false;
 }
 
 void ResultsView::Progress(int value, const QString& description)

gui/resultsview.h

@@ -59,13 +59,13 @@ public:
     void ShowResults(ShowTypes::ShowType type, bool show);
 
     /**
-    * @brief Clear results
-    *
-    */
-    void Clear();
+     * @brief Clear results and statistics and reset progressinfo.
+     * @param results Remove all the results from view?
+     */
+    void Clear(bool results);
 
     /**
-     * @brief Clear results for a specific file
+     * @brief Remove a file from the results.
      */
     void Clear(const QString &filename);