Show keyhint even with count prefix.

The keyhintwidget was not showing up when a keychain was prefixed with a
count. For example, 'g' would show a keyhint but '5g' would not. Now
keyhints are shown even when a count is given.

Resolves #3045.

qutebrowser/misc/keyhintwidget.py

@@ -26,6 +26,7 @@ It is intended to help discoverability of keybindings.
 
 import html
 import fnmatch
+import re
 
 from PyQt5.QtWidgets import QLabel, QSizePolicy
 from PyQt5.QtCore import pyqtSlot, pyqtSignal, Qt
@@ -85,6 +86,7 @@ class KeyHintView(QLabel):
         Args:
             prefix: The current partial keystring.
         """
+        _, prefix = re.match(r'^(\d*)(.*)', prefix).groups()
         if not prefix:
             self._show_timer.stop()
             self.hide()

tests/unit/misc/test_keyhints.py

@@ -92,6 +92,18 @@ def test_suggestions(keyhint, config_stub):
         ('a', 'yellow', 'c', 'message-info cmd-ac'))
 
 
+def test_suggestions_with_count(keyhint, config_stub):
+    """Test that keyhints are shown based on a prefix."""
+    bindings = {'normal': {'aa': 'message-info cmd-aa'}}
+    config_stub.val.bindings.default = bindings
+    config_stub.val.bindings.commands = bindings
+
+    keyhint.update_keyhint('normal', '2a')
+    assert keyhint.text() == expected_text(
+        ('a', 'yellow', 'a', 'message-info cmd-aa'),
+    )
+
+
 def test_special_bindings(keyhint, config_stub):
     """Ensure a prefix of '<' doesn't suggest special keys."""
     bindings = {'normal': {