document code a bit more

qutebrowser/browser/browsertab.py

@@ -98,6 +98,7 @@ class TabData:
                          Only used for QtWebKit.
         pinned: Flag to pin the tab.
         fullscreen: Whether the tab has a video shown fullscreen currently.
+        input_mode: current input mode for the tab. (insert, passthrough, normal)
     """
 
     keep_icon = attr.ib(False)

qutebrowser/mainwindow/tabbedbrowser.py

@@ -653,6 +653,7 @@ class TabbedBrowser(tabwidget.TabWidget):
             return
         if self._now_focused and config.val.tabs.mode_on_change == 'restore':
             current_mode = modeman.instance(self._win_id).mode
+            # only save insert & passthrough mode. otherwise default to normal
             if not current_mode in (usertypes.KeyMode.insert,usertypes.KeyMode.passthrough):
                 current_mode = usertypes.KeyMode.normal
             self._now_focused.data.input_mode = current_mode