Only toggle the Header on LMB.

lib/ui.coffee

@@ -191,8 +191,7 @@ UI = do ->
 
 
   dragstart = (e) ->
-    if e.type is 'mousedown' and e.button isnt 0 # not LMB
-      return
+    return if e.type is 'mousedown' and e.button isnt 0 # not LMB
     # prevent text selection
     e.preventDefault()
     if isTouching = e.type is 'touchstart'

src/features.coffee

@@ -131,7 +131,8 @@ Header =
   setBarVisibility: (hide) ->
     Header.headerToggler.firstElementChild.checked = hide
     (if hide then $.addClass else $.rmClass) Header.bar, 'autohide'
-  toggleBarVisibility: ->
+  toggleBarVisibility: (e) ->
+    return if e.type is 'mousedown' and e.button isnt 0 # not LMB
     hide = if @nodeName is 'INPUT'
       @checked
     else