Create ui checkbox for enabling straight paths

forms/mainwindow.ui

@@ -626,6 +626,22 @@
                      </property>
                     </widget>
                    </item>
+                   <item>
+                    <widget class="QCheckBox" name="checkBox_straightPaths">
+                     <property name="layoutDirection">
+                      <enum>Qt::LeftToRight</enum>
+                     </property>
+                     <property name="styleSheet">
+                      <string notr="true">margin-left: 10px</string>
+                     </property>
+                     <property name="text">
+                      <string>Straight Paths</string>
+                     </property>
+                     <property name="tristate">
+                      <bool>false</bool>
+                     </property>
+                    </widget>
+                   </item>
                    <item>
                     <widget class="QCheckBox" name="checkBox_ToggleGrid">
                      <property name="toolTip">

include/mainwindow.h

@@ -201,6 +201,7 @@ private slots:
     void on_comboBox_SecondaryTileset_currentTextChanged(const QString &arg1);
     void on_pushButton_ChangeDimensions_clicked();
     void on_checkBox_smartPaths_stateChanged(int selected);
+    void on_checkBox_straightPaths_stateChanged(int selected);
     void on_checkBox_Visibility_clicked(bool checked);
     void on_checkBox_ToggleBorder_stateChanged(int arg1);
 

src/mainwindow.cpp

@@ -2498,6 +2498,12 @@ void MainWindow::on_checkBox_smartPaths_stateChanged(int selected)
     }
 }
 
+void MainWindow::on_checkBox_straightPaths_stateChanged(int selected)
+{
+    bool enabled = selected == Qt::Checked;
+    editor->settings->straightPathsEnabled = enabled;
+}
+
 void MainWindow::on_checkBox_ToggleBorder_stateChanged(int selected)
 {
     bool visible = selected != 0;