Work around the tabbar cut font issue

TODO

@@ -187,6 +187,9 @@ Upstream Bugs
 - QNetworkReplyImplPrivate::error: Internal problem, this method must only be called once.
     https://bugreports.qt-project.org/browse/QTBUG-30298
 
+- Tabbar texts get cut off when styled and elided
+  https://bugreports.qt-project.org/browse/QTBUG-15203
+
 
 Probably fixed crashes
 ======================

qutebrowser/widgets/_tabbedbrowser.py

@@ -22,13 +22,13 @@ from functools import partial
 
 from PyQt5.QtWidgets import QApplication, QSizePolicy
 from PyQt5.QtCore import pyqtSignal, pyqtSlot, QSize
-from PyQt5.QtGui import QClipboard, QIcon
+from PyQt5.QtGui import QClipboard
 
 import qutebrowser.utils.url as urlutils
 import qutebrowser.utils.message as message
 import qutebrowser.config.config as config
 import qutebrowser.commands.utils as cmdutils
-from qutebrowser.widgets._tabwidget import TabWidget
+from qutebrowser.widgets._tabwidget import TabWidget, EmptyTabIcon
 from qutebrowser.widgets.webview import WebView
 from qutebrowser.browser.signalfilter import SignalFilter
 from qutebrowser.browser.curcommand import CurCommandDispatcher
@@ -470,7 +470,7 @@ class TabbedBrowser(TabWidget):
             tab: The tab where the signal belongs to.
         """
         tab.signal_cache.clear()
-        self.setTabIcon(self.indexOf(tab), QIcon())
+        self.setTabIcon(self.indexOf(tab), EmptyTabIcon())
 
     @pyqtSlot(str)
     def on_title_changed(self, text):

qutebrowser/widgets/_tabwidget.py

@@ -19,12 +19,31 @@
 
 from PyQt5.QtCore import pyqtSlot, Qt
 from PyQt5.QtWidgets import QTabWidget, QTabBar, QSizePolicy
+from PyQt5.QtGui import QIcon, QPixmap
 
 import qutebrowser.config.config as config
 from qutebrowser.config.style import set_register_stylesheet
 from qutebrowser.utils.style import Style
 
 
+class EmptyTabIcon(QIcon):
+
+    """An empty icon for a tab.
+
+    Qt somehow cuts text off when padding is used for the tabbar, see
+    https://bugreports.qt-project.org/browse/QTBUG-15203
+
+    Until we find a better solution we use this hack of using a simple
+    transparent icon to get some padding, because when a real favicon is set,
+    the padding seems to be fine...
+    """
+
+    def __init__(self):
+        pix = QPixmap(2, 16)
+        pix.fill(Qt.transparent)
+        super().__init__(pix)
+
+
 class TabWidget(QTabWidget):
 
     """The tabwidget used for TabbedBrowser.
@@ -47,7 +66,6 @@ class TabWidget(QTabWidget):
         QTabBar::tab {{
             {color[tab.bg]}
             {color[tab.fg]}
-            padding: 0px 5px 0px 5px;
             border-right: 2px solid {color[tab.seperator]};
             min-width: {config[tabbar][min-tab-width]}px;
             max-width: {config[tabbar][max-tab-width]}px;