Index: Lib/idlelib/config-keys.def
===================================================================
--- Lib/idlelib/config-keys.def	(revision 70642)
+++ Lib/idlelib/config-keys.def	(working copy)
@@ -48,7 +48,7 @@
 newline-and-indent=<key-return> <key-kp_enter>
 smart-indent=<key-tab>
 indent-region=<control-key-bracketright>
-dedent-region=<control-key-bracketleft>
+dedent-region=<control-key-bracketleft> <shift-key-tab>
 comment-region=<alt-key-3> <meta-key-3>
 uncomment-region=<alt-key-4> <meta-key-4>
 tabify-region=<alt-key-5> <meta-key-5>
@@ -99,7 +99,7 @@
 newline-and-indent=<key-return> <key-kp_enter>
 smart-indent=<key-tab>
 indent-region=<control-key-bracketright>
-dedent-region=<control-key-bracketleft>
+dedent-region=<control-key-bracketleft> <shift-key-tab>
 comment-region=<alt-key-3>
 uncomment-region=<alt-key-4>
 tabify-region=<alt-key-5>
@@ -150,7 +150,7 @@
 newline-and-indent=<key-return> <key-kp_enter>
 smart-indent=<key-tab>
 indent-region=<command-key-bracketright>
-dedent-region=<command-key-bracketleft>
+dedent-region=<command-key-bracketleft> <shift-key-tab>
 comment-region=<control-key-3>
 uncomment-region=<control-key-4>
 tabify-region=<control-key-5>
Index: Lib/idlelib/configHandler.py
===================================================================
--- Lib/idlelib/configHandler.py	(revision 70674)
+++ Lib/idlelib/configHandler.py	(working copy)
@@ -598,7 +598,7 @@
 '<<newline-and-indent>>': ['<key-return> <key-kp_enter>'],
 '<<smart-indent>>': ['<key-tab>'],
 '<<indent-region>>': ['<control-key-bracketright>'],
- '<<dedent-region>>': ['<control-key-bracketleft>'],
+ '<<dedent-region>>': ['<shift-key-tab>'],
 '<<comment-region>>': ['<alt-key-3>'],
 '<<uncomment-region>>': ['<alt-key-4>'],
 '<<tabify-region>>': ['<alt-key-5>'],
Index: Lib/idlelib/EditorWindow.py
===================================================================
--- Lib/idlelib/EditorWindow.py	(revision 70642)
+++ Lib/idlelib/EditorWindow.py	(working copy)
@@ -155,6 +155,16 @@
 text.bind("<<del-word-right>>", self.del_word_right)
 text.bind("<<beginning-of-line>>", self.home_callback)
 
+ # A relatively common binding for dedent-region is Shift-Tab which
+ # usually is already controlled by the virtual event PrevWindow
+ # defined by Tk. We check this here to override the default behaviour.
+ prevwindow_info = text.event_info('<<prevwindow>>')
+ for shortcut in text.event_info('<<dedent-region>>'):
+ if shortcut in prevwindow_info:
+ # Instead of moving to the previous widget, we will want
+ # to dedent.
+ text.bind('<<prevwindow>>', self.dedent_region_event)
+
 if flist:
 flist.inversedict[self] = key
 if key:
</div><div class="naked_ctrl">
<form action="/index.cgi/contrast" method="get" name="gate">
<p><a href="http://altstyle.alfasado.net">AltStyle</a> によって変換されたページ <a href="https://bugs.python.org/file13457/common_dedent.diff">(-&gt;オリジナル)</a>
/ <label>アドレス: <input type="text" name="naked_post_url" value="https://bugs.python.org/file13457/common_dedent.diff" size="22" /></label> <label>モード: <select name="naked_post_mode">
<option value="default">デフォルト</option>
<option value="speech">音声ブラウザ</option>
<option value="ruby">ルビ付き</option>
<option value="contrast" selected="selected">配色反転</option>
<option value="larger-text">文字拡大</option>
<option value="mobile">モバイル</option>
</select>
<input type="submit" value="表示" />
</p>
</form>
</div>