Fix tab title when webpage has no title

qutebrowser/TODO

@@ -4,7 +4,6 @@ autostart
 show partial commands
 statusbar with widgets
 scrolling simplifying
-set tab titles correctly (e.g. pyeval)
 
 bugs:
 

qutebrowser/app.py

@@ -2,6 +2,7 @@ import sys
 import argparse
 import logging
 from PyQt5.QtWidgets import QWidget, QApplication
+from PyQt5.QtCore import QUrl
 from qutebrowser.widgets.mainwindow import MainWindow
 from qutebrowser.commands.keys import KeyParser
 import qutebrowser.commands.utils as cmdutils
@@ -97,6 +98,8 @@ class QuteBrowser(QApplication):
         except Exception as e:
             out = ': '.join([e.__class__.__name__, str(e)])
 
+        # FIXME we probably want some nicer interface to display these about: pages
         tab = self.mainwindow.tabs.currentWidget()
+        tab.setUrl(QUrl('about:pyeval'))
         tab.setContent(out.encode('UTF-8'), 'text/plain')
 

qutebrowser/widgets/browser.py

@@ -23,6 +23,10 @@ class TabbedBrowser(TabWidget):
         self.progress_changed(tab.progress)
         tab.loadProgress.connect(self.progress_changed)
         tab.loadFinished.connect(self.load_finished)
+        # FIXME should we really bind this to loadStarted? Sometimes the URL
+        # isn't set correctly at this point, e.g. when doing
+        # setContent(..., baseUrl=QUrl('foo'))
+        tab.loadStarted.connect(self.init_title)
         tab.titleChanged.connect(self.update_title)
 
     def openurl(self, url):
@@ -122,6 +126,10 @@ class TabbedBrowser(TabWidget):
         if text:
             self.setTabText(self.indexOf(self.sender()), text)
 
+    def init_title(self):
+        s = self.sender()
+        self.setTabText(self.indexOf(s), s.url().toString())
+
     def filter_signals(self, signal, *args):
         dbgstr = "{} ({})".format(
             signal.signal, ','.join([str(e) for e in args]))