Make key config migration for clearing downloads.

qutebrowser/config/configdata.py

@@ -1497,4 +1497,6 @@ CHANGED_KEY_COMMANDS = [
 
     (re.compile(r'^search *;; *clear-keychain$'), r'clear-keychain ;; search'),
     (re.compile(r'^leave-mode$'), r'clear-keychain ;; leave-mode'),
+
+    (re.compile(r'^download-remove --all$'), r'download-clear'),
 ]

tests/unit/config/test_config.py

@@ -251,6 +251,8 @@ class TestKeyConfigParser:
             ('search;;foo', None),
             ('leave-mode', 'clear-keychain ;; leave-mode'),
             ('leave-mode ;; foo', None),
+
+            ('download-remove --all', 'download-clear'),
         ]
     )
     def test_migrations(self, old, new_expected):