Stabilize hint test which failed on macOS

qutebrowser/browser/hints.py

@@ -792,6 +792,8 @@ class HintManager(QObject):
         else:
             self._context.filterstr = filterstr
 
+        log.hints.debug("Filtering hints on {!r}".format(filterstr))
+
         visible = []
         for label in self._context.all_labels:
             try:

tests/end2end/features/hints.feature

@@ -296,6 +296,7 @@ Feature: Using hints
         And I set hints.mode to number
         And I hint with args "all"
         And I press the key "s"
+        And I wait for "Filtering hints on 's'" in the log
         And I run :follow-hint 1
         Then data/numbers/7.txt should be loaded