Add middle click to close fitting tab (#1804)

gui/chrome_tabs.py

@@ -736,6 +736,7 @@ class _TabsContainer(wx.Panel):
         self.Bind(wx.EVT_ERASE_BACKGROUND, self.OnErase)
         self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
         self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
+        self.Bind(wx.EVT_MIDDLE_UP, self.OnMiddleUp)
         self.Bind(wx.EVT_MOTION, self.OnMotion)
         self.Bind(wx.EVT_SIZE, self.OnSize)
         self.Bind(wx.EVT_SYS_COLOUR_CHANGED, self.OnSysColourChanged)
@@ -776,6 +777,29 @@ class _TabsContainer(wx.Panel):
 
             self.dragged_tab = tab
 
+    def OnMiddleUp(self, event):
+        mposx, mposy = event.GetPosition()
+
+        tab = self.FindTabAtPos(mposx, mposy)
+
+        if tab is None or not tab.closeable:  # if not able to close, return False
+            return False
+
+        index = self.tabs.index(tab)
+        ev = PageClosing(index)
+        wx.PostEvent(self.Parent, ev)
+
+        if ev.isVetoed():
+            return False
+
+        index = self.GetTabIndex(tab)
+        self.Parent.DeletePage(index)
+        wx.PostEvent(self.Parent, PageClosed(index=index))
+
+        sel = self.GetSelected()
+        if sel is not None:
+            wx.PostEvent(self.Parent, PageChanged(-1, sel))
+
     def OnMotion(self, event):
         """
         Determines what happens when the mouse moves. This handles primarily