Update docs

doc/changelog.asciidoc

@@ -27,6 +27,7 @@ Added
     new page is loaded.
   * `colors.completion.item.selected.match.fg` which allows configuring the
     text color for the matching text in the currently selected completion item.
+  * `tabs.undo_stack_size` to limit how many undo entries are kept for closed tabs.
 - New commands:
   * `:reverse-selection` (`o` in caret mode) to swap the stationary/moving ends
     of a selection.

doc/help/settings.asciidoc

@@ -282,6 +282,7 @@
 |<<tabs.title.alignment,tabs.title.alignment>>|Alignment of the text inside of tabs.
 |<<tabs.title.format,tabs.title.format>>|Format to use for the tab title.
 |<<tabs.title.format_pinned,tabs.title.format_pinned>>|Format to use for the tab title for pinned tabs. The same placeholders like for `tabs.title.format` are defined.
+|<<tabs.undo_stack_size,tabs.undo_stack_size>>|Number of close tab actions to remember, per window (-1 for no maximum).
 |<<tabs.width,tabs.width>>|Width (in pixels or as percentage of the window) of the tab bar if it's vertical.
 |<<tabs.wrap,tabs.wrap>>|Wrap when changing tabs.
 |<<url.auto_search,url.auto_search>>|What search to start when something else than a URL is entered.
@@ -3536,6 +3537,14 @@ Type: <<types,FormatString>>
 
 Default: +pass:[{index}]+
 
+[[tabs.undo_stack_size]]
+=== tabs.undo_stack_size
+Number of close tab actions to remember, per window (-1 for no maximum).
+
+Type: <<types,Int>>
+
+Default: +pass:[100]+
+
 [[tabs.width]]
 === tabs.width
 Width (in pixels or as percentage of the window) of the tab bar if it's vertical.

qutebrowser/mainwindow/tabbedbrowser.py

@@ -132,7 +132,8 @@ class TabbedBrowser(QWidget):
         else:
             self.cur_load_started.connect(self._leave_modes_on_load)
 
-        # This init is never used, it is immediately thrown away in the next line.
+        # This init is never used, it is immediately thrown away in the next
+        # line.
         self._undo_stack = collections.deque()
         self._update_stack_size()
         self._filter = signalfilter.SignalFilter(win_id, self)