panel: middle click to close window (#210)

* panel: middle click to close window

* fix spacing, remove tab

* add option

* remove include widget.hpp, fix whitespace

* move to separate option group

* uncrustify

Author: carterprince

metadata/panel.xml

@@ -336,5 +336,12 @@ Set to -1 to only run it by clicking the button.
 		</entry>
 	</option>
 	</group>
+	<group>
+	<_short>Window List</_short>
+	<option name="middle_click_close" type="bool">
+		<_short>Middle Click Closes Windows</_short>
+		<default>false</default>
+	</option>
+	</group>
 	</plugin>
 </wf-shell>

src/panel/widgets/window-list/toplevel.cpp

@@ -11,7 +11,6 @@
 #include <gdk/gdkwayland.h>
 #include <cmath>
 
-
 #include "toplevel.hpp"
 #include "gtk-utils.hpp"
 #include "panel.hpp"
@@ -44,6 +43,8 @@ class WayfireToplevel::impl
 
     Glib::ustring app_id, title;
 
+    WfOption<bool> middle_click_close{"panel/middle_click_close"};
+
   public:
     WayfireWindowList *window_list;
 
@@ -182,14 +183,20 @@ class WayfireToplevel::impl
 
     bool on_button_press_event(GdkEventButton *event)
     {
-        if ((event->type == GDK_BUTTON_PRESS) && (event->button == 3))
-        {
-            menu.popup(event->button, event->time);
-            return true; // It has been handled.
-        } else
+        if (event->type == GDK_BUTTON_PRESS)
         {
-            return false;
+            if (event->button == 3)
+            {
+                menu.popup(event->button, event->time);
+                return true; // It has been handled.
+            } else if ((event->button == 2) && middle_click_close)
+            {
+                zwlr_foreign_toplevel_handle_v1_close(handle);
+                return true;
+            }
         }
+
+        return false;
     }
 
     void on_menu_minimize()