Fix handling of spaces in completion

This is a regression introduced in
faa052ad6f.

Fixes #1934.

qutebrowser/completion/models/sortfilter.py

@@ -69,7 +69,7 @@ class CompletionFilterModel(QSortFilterProxyModel):
         with debug.log_time(log.completion, 'Setting filter pattern'):
             self.pattern = val
             val = re.escape(val)
-            val = val.replace(r'\ +', r'.*')
+            val = re.sub(r'\ +', r'.*', val)
             self.pattern_re = re.compile(val, re.IGNORECASE)
             self.invalidate()
             sortcol = 0

tests/unit/completion/test_sortfilter.py

@@ -62,6 +62,8 @@ def _extract_model_data(model):
 
 @pytest.mark.parametrize('pattern, data, expected', [
     ('foo', 'barfoobar', True),
+    ('foo bar', 'barfoobar', True),
+    ('foo   bar', 'barfoobar', True),
     ('foo', 'barFOObar', True),
     ('Foo', 'barfOObar', True),
     ('ab', 'aonebtwo', False),