buttons: Connect PopUp confirmation display for topics via keypress.

On pressing TOGGLE_MUTE_TOPIC, we now ask for confirmation before
performing the action of muting/unmuting topics.

Tests added.

Author: sumanthvrao

tests/ui_tools/test_buttons.py

@@ -318,6 +318,15 @@ def test_init_calls_mark_muted(self, mocker, stream_name, title,
         else:
             mark_muted.assert_not_called()
 
+    @pytest.mark.parametrize('key', keys_for_command('TOGGLE_MUTE_TOPIC'))
+    def test_keypress_TOGGLE_MUTE_TOPIC(self, mocker, topic_button, key,
+                                        widget_size):
+        size = widget_size(topic_button)
+        pop_up = mocker.patch(
+            'zulipterminal.core.Controller.topic_muting_confirmation_popup')
+        topic_button.keypress(size, key)
+        pop_up.assert_called_once_with(topic_button)
+
 
 class TestMessageLinkButton:
     @pytest.fixture(autouse=True)

zulipterminal/ui_tools/buttons.py

@@ -342,6 +342,11 @@ def mark_unmuted(self) -> None:
             # All messages in this topic are read.
             self.set_button_counts(0)
 
+    def keypress(self, size: urwid_Size, key: str) -> Optional[str]:
+        if is_command_key('TOGGLE_MUTE_TOPIC', key):
+            self.controller.topic_muting_confirmation_popup(self)
+        return super().keypress(size, key)
+
 
 class DecodedStream(TypedDict):
     stream_id: Optional[int]