Gui: Only measure with Quick Measure if showing in status bar

src/Gui/MainWindow.cpp

@@ -2315,6 +2315,11 @@ void MainWindow::setRightSideMessage(const QString& message)
     d->rightSideLabel->setText(message.simplified());
 }
 
+bool MainWindow::isRightSideMessageVisible() const
+{
+    return d->rightSideLabel->isVisible();
+}
+
 void MainWindow::showStatus(int type, const QString& message)
 {
     if(QApplication::instance()->thread() != QThread::currentThread()) {

src/Gui/MainWindow.h

@@ -266,6 +266,7 @@ public Q_SLOTS:
 
     void showMessage (const QString & message, int timeout = 0);
     void setRightSideMessage(const QString & message);
+    bool isRightSideMessageVisible() const;
 
     // Set main window title
     void setWindowTitle(const QString& string);

src/Mod/Measure/Gui/QuickMeasure.cpp

@@ -114,18 +114,23 @@ void QuickMeasure::tryMeasureSelection()
 
 bool QuickMeasure::shouldMeasure(const Gui::SelectionChanges& msg) const
 {
+    if (!Gui::getMainWindow()->isRightSideMessageVisible()) {
+        // don't measure if there's no where to show the result
+        return false;
+    }
 
-    // measure only IF
     Gui::Document* doc = Gui::Application::Instance->activeDocument();
-    if (doc) {
-        // we have a document
-        if (msg.Type == Gui::SelectionChanges::AddSelection
-            || msg.Type == Gui::SelectionChanges::RmvSelection
-            || msg.Type == Gui::SelectionChanges::SetSelection
-            || msg.Type == Gui::SelectionChanges::ClrSelection) {
-            // the event is about a change in selected objects
-            return true;
-        }
+    if (!doc) {
+        // no active document
+        return false;
+    }
+
+    if (msg.Type == Gui::SelectionChanges::AddSelection
+        || msg.Type == Gui::SelectionChanges::RmvSelection
+        || msg.Type == Gui::SelectionChanges::SetSelection
+        || msg.Type == Gui::SelectionChanges::ClrSelection) {
+        // the event is about a change in selected objects
+        return true;
     }
     return false;
 }