Improve keyhint tests

This also brings them back to 100% coverage

tests/unit/misc/test_keyhints.py

@@ -61,6 +61,21 @@ def keyhint(qtbot, config_stub, key_config_stub):
     return keyhint
 
 
+def test_show_and_hide(qtbot, keyhint):
+    with qtbot.waitSignal(keyhint.update_geometry):
+        keyhint.show()
+    qtbot.waitForWindowShown(keyhint)
+    keyhint.update_keyhint('normal', '')
+    assert not keyhint.isVisible()
+
+
+def test_position_change(keyhint, config_stub):
+    config_stub.set('ui', 'status-position', 'top')
+    stylesheet = keyhint.styleSheet()
+    assert 'border-bottom-right-radius' in stylesheet
+    assert 'border-top-right-radius' not in stylesheet
+
+
 def test_suggestions(keyhint, key_config_stub):
     """Test that keyhints are shown based on a prefix."""
     # we want the dict to return sorted items() for reliable testing