3.7a2preで初期化に失敗するようになっていたのを修正

git-svn-id: http://www.cozmixng.org/repos/piro/treestyletab/trunk@6325 599a83e7-65a4-db11-8015-0010dcdd6dc2

content/treestyletab/treestyletabbrowser.js

@@ -389,8 +389,38 @@ TreeStyleTabBrowser.prototype = {
 			)
 		);
 
+		if ('' in b) { // Firefox 3.7-
+			eval('b._handleKeyEvent = '+
+				b._handleKeyEvent.toSource().replace(
+					'this.moveTabOver(aEvent);',
+					<![CDATA[
+						if (!this.treeStyleTab.isVertical ||
+							!this.treeStyleTab.moveTabLevel(aEvent)) {
+							$&
+						}
+					]]>
+				).replace(
+					'this.moveTabForward();',
+					<![CDATA[
+						if (this.treeStyleTab.isVertical ||
+							!this.treeStyleTab.moveTabLevel(aEvent)) {
+							$&
+						}
+					]]>
+				).replace(
+					'this.moveTabBackward();',
+					<![CDATA[
+						if (this.treeStyleTab.isVertical ||
+							!this.treeStyleTab.moveTabLevel(aEvent)) {
+							$&
+						}
+					]]>
+				)
+			);
+		}
+		else if ('_keyEventHandler' in b) { // -Firefox 3.6
 			eval('b._keyEventHandler.handleEvent = '+
-			b._keyEventHandler.handleEvent.toSource().replace(
+				_keyEventHandler.handleEvent.toSource().replace(
 					'this.tabbrowser.moveTabOver(aEvent);',
 					<![CDATA[
 						if (!this.tabbrowser.treeStyleTab.isVertical ||
@@ -416,6 +446,7 @@ TreeStyleTabBrowser.prototype = {
 					]]>
 				)
 			);
+		}
 
 		eval('b.loadTabs = '+
 			b.loadTabs.toSource().replace(