Urwid 3: Stop using deprecated FlowWidget

Closes gh-681

Author: inducer

pudb/source_view.py

@@ -30,7 +30,9 @@
 TABSTOP = 8
 
 
-class SourceLine(urwid.FlowWidget):
+class SourceLine(urwid.Widget):
+    _sizing = frozenset([urwid.Sizing.FLOW])
+
     def __init__(self, dbg_ui, text, line_nr="", attr=None, has_breakpoint=False):
         self.dbg_ui = dbg_ui
         self.text = text

pudb/ui_tools.py

@@ -140,7 +140,9 @@ def keypress(self, size, key):
 
 # {{{ debugger-specific stuff
 
-class StackFrame(urwid.FlowWidget):
+class StackFrame(urwid.Widget):
+    _sizing = frozenset([urwid.Sizing.FLOW])
+
     def __init__(self, is_current, name, class_name, filename, line):
         self.is_current = is_current
         self.name = name
@@ -184,7 +186,9 @@ def keypress(self, size, key):
         return key
 
 
-class BreakpointFrame(urwid.FlowWidget):
+class BreakpointFrame(urwid.Widget):
+    _sizing = frozenset([urwid.Sizing.FLOW])
+
     def __init__(self, is_current, filename, breakpoint):
         self.is_current = is_current
         self.filename = filename

pudb/var_view.py

@@ -212,7 +212,9 @@ def __str__(self):
 
 # {{{ widget
 
-class VariableWidget(urwid.FlowWidget):
+class VariableWidget(urwid.Widget):
+    _sizing = frozenset([urwid.Sizing.FLOW])
+
     PREFIX = "| "
 
     def __init__(self, parent, var_label, value_str, id_path,