Public bug reported:
When attempting to draw an empty Pile or Columns using urwid 2.6.4-1, it
fails with the following exception:
File "urwid/event_loop/main_loop.py", line 672, in draw_screen
canvas = self._topmost_widget.render(self.screen_size, focus=True)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/popup.py", line 127, in render
self._update_overlay(size, focus)
File "urwid/widget/popup.py", line 100, in _update_overlay
canv = self._original_widget.render(size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 711, in render
canv = get_delegate(self).render(size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/attr_map.py", line 158, in render
canv = self._original_widget.render(size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/pile.py", line 829, in render
canv = w.render(w_size, focus=focus and item_focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 711, in render
canv = get_delegate(self).render(size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/padding.py", line 330, in render
canv = self._original_widget.render((maxcol,) + size[1:], focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 112, in cached_render
canv = fn(self, size, focus=focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/pile.py", line 822, in render
_widths, heights, size_args = self.get_rows_sizes(size, focus)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/pile.py", line 730, in get_rows_sizes
heights.append(w.pack(w_h_arg, item_focus)[1])
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/padding.py", line 276, in pack
return super().pack(size, focus)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "urwid/widget/widget.py", line 401, in pack
raise WidgetError(f"Cannot pack (maxcol,) size, this is not a flow widget:
{self!r}")
urwid.widget.widget.WidgetError: Cannot pack (maxcol,) size, this is not a flow
widget: <Padding widget <FocusTrackingPile widget> align=<Align.CENTER:
'center'> min_width=14 width=14>
There is an upstream fix [1] that is released in urwid 2.6.5.
https://github.com/urwid/urwid/pull/843
** Affects: subiquity
Importance: Undecided
Status: Invalid
** Affects: urwid (Ubuntu)
Importance: Undecided
Assignee: Olivier Gayot (ogayot)
Status: In Progress
** Also affects: subiquity
Importance: Undecided
Status: New
** Changed in: subiquity
Status: New => Invalid
** Changed in: urwid (Ubuntu)
Assignee: (unassigned) => Olivier Gayot (ogayot)
** Changed in: urwid (Ubuntu)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/2058388
Title:
urwid 2.6.4-1 exception when drawing an empty Pile or Columns
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