Fixed #1861 (GUI: Allow hiding error) Disabled menu item when not applicable

gui/main.ui

@@ -464,6 +464,9 @@
    </property>
   </action>
   <action name="mActionShowHidden">
+   <property name="enabled">
+    <bool>false</bool>
+   </property>
    <property name="text">
     <string>Show &amp;hidden</string>
    </property>

gui/mainwindow.cpp

@@ -86,6 +86,7 @@ MainWindow::MainWindow() :
     connect(mUI.mActionAuthors, SIGNAL(triggered()), this, SLOT(ShowAuthors()));
     connect(mThread, SIGNAL(Done()), this, SLOT(CheckDone()));
     connect(mUI.mResults, SIGNAL(GotResults()), this, SLOT(ResultsAdded()));
+    connect(mUI.mResults, SIGNAL(ResultsHidden(bool)), mUI.mActionShowHidden, SLOT(setEnabled(bool)));
     connect(mUI.mMenuView, SIGNAL(aboutToShow()), this, SLOT(AboutToShowViewMenu()));
 
     connect(mUI.mActionNewProjectFile, SIGNAL(triggered()), this, SLOT(NewProjectFile()));

gui/resultstree.cpp

@@ -341,6 +341,7 @@ void ResultsTree::ShowHiddenResults()
         }
     }
     RefreshTree();
+    emit ResultsHidden(false);
 }
 
 
@@ -670,6 +671,7 @@ void ResultsTree::HideResult()
         mContextItem->setData(QVariant(data));
 
         RefreshTree();
+        emit ResultsHidden(true);
     }
 }
 

gui/resultstree.h

@@ -122,6 +122,15 @@ public:
     *
     */
     void Translate();
+
+signals:
+    /**
+    * @brief Signal that results have been hidden or shown
+    *
+    * @param hidden true if there are some hidden results, or false if there are not
+    */
+    void ResultsHidden(bool hidden);
+
 protected slots:
     /**
     * @brief Slot to quickstart an error with default application

gui/resultsview.cpp

@@ -33,6 +33,8 @@ ResultsView::ResultsView(QWidget * parent) :
     mShowNoErrorsMessage(true)
 {
     mUI.setupUi(this);
+
+    connect(mUI.mTree, SIGNAL(ResultsHidden(bool)), this, SIGNAL(ResultsHidden(bool)));
 }
 
 void ResultsView::Initialize(QSettings *settings, ApplicationList *list)

gui/resultsview.h

@@ -146,6 +146,12 @@ signals:
     */
     void GotResults();
 
+    /**
+    * @brief Signal that results have been hidden or shown
+    *
+    * @param hidden true if there are some hidden results, or false if there are not
+    */
+    void ResultsHidden(bool hidden);
 
 public slots: