Fix tab and webkit background colors clearing on config change

Per the qt docs, we should not call setPalette on a class that also
uses stylesheets. Since #4637, we set a stylesheet on the application,
so we cannot use setPalette anymore. This commit refactors those calls
to use stylesheets instead.

As far as I can tell, QPalette is OK to use when manually drawing (we
currently use it there).

1 files changed, 10 insertions, 0 deletions

diff --git a/tests/unit/utils/test_qtutils.py b/tests/unit/utils/test_qtutils.py
index e30200bbc..2e108210b 100644
--- a/tests/unit/utils/test_qtutils.py
+++ b/tests/unit/utils/test_qtutils.py
@@ -29,6 +29,7 @@ import unittest.mock
 import pytest
 from PyQt5.QtCore import (QDataStream, QPoint, QUrl, QByteArray, QIODevice,
                           QTimer, QBuffer, QFile, QProcess, QFileDevice)
+from PyQt5.QtGui import QColor
 
 from qutebrowser.utils import qtutils, utils
 import overflow_test_cases
@@ -223,6 +224,15 @@ def test_qdatastream_status_count():
     assert len(status_vals) == 4
 
 
+@pytest.mark.parametrize('color, expected', [
+    (QColor('red'), 'rgba(255, 0, 0, 255)'),
+    (QColor('blue'), 'rgba(0, 0, 255, 255)'),
+    (QColor(1, 3, 5, 7), 'rgba(1, 3, 5, 7)'),
+])
+def test_qcolor_to_qsscolor(color, expected):
+    assert qtutils.qcolor_to_qsscolor(color) == expected
+
+
 @pytest.mark.parametrize('obj', [
     QPoint(23, 42),
     QUrl('http://www.qutebrowser.org/'),