Cancel register key input with escape

qutebrowser/keyinput/modeparsers.py

@@ -290,6 +290,10 @@ class RegisterKeyParser(keyparser.BaseKeyParser):
         Return:
             True if event has been handled, False otherwise.
         """
+        if e.key() == Qt.Key_Escape:
+            self.request_leave.emit(self._mode, "register key cancelled", True)
+            return True
+
         if utils.keyevent_to_string(e) is None:
             # this is a modifier key, let it pass and keep going
             return False

tests/end2end/features/keyinput.feature

@@ -255,3 +255,8 @@ Feature: Keyboard input
         And I press the key "a"
         And I wait for "hints: *" in the log
         Then no crash should happen
+
+    Scenario: Cancelling key input
+        When I run :record-macro
+        And I press the key "<Escape>"
+        Then "Leaving mode KeyMode.record_macro (reason: register key cancelled)" should be logged