feat: Prevent Tab key from moving focus outside active viewport tools

src/ViewportWidget.cpp

@@ -1054,6 +1054,14 @@ void ViewportWidget::keyPressEvent(QKeyEvent *event)
     QOpenGLWidget::keyPressEvent(event);
 }
 
+bool ViewportWidget::focusNextPrevChild(bool next)
+{
+    if (m_activeTool != static_cast<int>(ApplicationController::ToolType::None)) {
+        return false;
+    }
+    return QOpenGLWidget::focusNextPrevChild(next);
+}
+
 void ViewportWidget::onSketchModeStarted(SketchPlane plane)
 {
     m_currentPlane = plane;