Fixing commit for merging. This is a new feature to add a gui button for

chaging the global thickness.

src/widgets/capture/capturewidget.cpp

@@ -958,6 +958,26 @@ void CaptureWidget::handleButtonSignal(CaptureTool::Request r)
                 w->show();
             }
             break;
+        case CaptureTool::REQ_INCREASE_TOOL_SIZE:
+
+            // increase thickness
+            m_context.thickness = qBound(0, m_context.thickness + 1, 100);
+
+            // show notifier circle
+            m_notifierBox->showMessage(QString::number(m_context.thickness));
+
+            emit thicknessChanged(m_context.thickness);
+            break;
+        case CaptureTool::REQ_DECREASE_TOOL_SIZE:
+
+            // decrease thickness
+            m_context.thickness = qBound(0, m_context.thickness - 1, 100);
+
+            // show notifier circle
+            m_notifierBox->showMessage(QString::number(m_context.thickness));
+
+            emit thicknessChanged(m_context.thickness);
+            break;
         default:
             break;
     }