console: mark view indiciator, fix empty flow list behaviour

Fixes #1782

mitmproxy/tools/console/flowlist.py

@@ -178,8 +178,6 @@ class FlowItem(urwid.WidgetWrap):
         elif key == "m":
             self.flow.marked = not self.flow.marked
             signals.flowlist_change.send(self)
-        elif key == "M":
-            self.master.view.toggle_marked()
         elif key == "r":
             try:
                 self.master.replay_request(self.flow)
@@ -375,6 +373,8 @@ class FlowListBox(urwid.ListBox):
                 prompt = "Load flows",
                 callback = self.master.load_flows_callback
             )
+        elif key == "M":
+            self.master.view.toggle_marked()
         elif key == "n":
             signals.status_prompt_onekey.send(
                 prompt = "Method",

mitmproxy/tools/console/statusbar.py

@@ -263,8 +263,12 @@ class StatusBar(urwid.WidgetWrap):
         else:
             arrow = common.SYMBOL_DOWN
 
+        marked = ""
+        if self.master.view.show_marked:
+            marked = "M"
+
         t = [
-            ('heading', ("%s [%s/%s]" % (arrow, offset, fc)).ljust(11)),
+            ('heading', ("%s %s [%s/%s]" % (arrow, marked, offset, fc)).ljust(11)),
         ]
 
         if self.master.server.bound:

test/mitmproxy/addons/test_view.py

@@ -123,6 +123,11 @@ def test_filter():
     v.set_filter(None)
 
     assert len(v) == 4
+    v.toggle_marked()
+    assert len(v) == 0
+    v.toggle_marked()
+    assert len(v) == 4
+
     v[1].marked = True
     v.toggle_marked()
     assert len(v) == 1