Fix: move lines (focus by clicking)

MapperGLCanvas.cpp

@@ -116,7 +116,7 @@ void MapperGLCanvas::keyPressEvent(QKeyEvent* event)
   p.y += yMove;
   quad.setVertex(current, p);
 
-  draw();
+  updateGL();
 }
 
 void MapperGLCanvas::paintEvent(QPaintEvent* event)

main.cpp

@@ -30,6 +30,9 @@ int main(int argc, char *argv[])
   splitter.addWidget(&sourceCanvas);
   splitter.addWidget(&destinationCanvas);
 
+  sourceCanvas.setFocusPolicy(Qt::ClickFocus);
+  destinationCanvas.setFocusPolicy(Qt::ClickFocus);
+
   splitter.setWindowTitle(QObject::tr("Libremapping"));
   splitter.resize(640, 480);
   splitter.show();