Fix #5755: Locale preflet crashing when dragging languages around

* The flag bitmaps being part of list items were not treated properly in
  the language item's copy constructor (the bitmap pointer was copied, not
  the bitmap object itself). As a result, bitmap objects were freed more than 
  once. 
* some cleanup

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@36487 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/preferences/locale/LanguageListView.cpp

@@ -37,6 +37,15 @@ LanguageListItem::LanguageListItem(const char* text, const char* code)
 }
 
 
+LanguageListItem::LanguageListItem(const LanguageListItem& other)
+	:
+	BStringItem(other.Text()),
+	fLanguageCode(other.fLanguageCode),
+	fIcon(other.fIcon ? new(std::nothrow) BBitmap(other.fIcon) : NULL)
+{
+}
+
+
 LanguageListItem::~LanguageListItem()
 {
 	delete fIcon;

src/preferences/locale/LanguageListView.h

@@ -19,34 +19,18 @@
 class LanguageListItem: public BStringItem {
 	public:
 		LanguageListItem(const char* text, const char* code);
-
-		LanguageListItem(const LanguageListItem& other)
-			:
-			BStringItem(other.Text()),
-			fLanguageCode(other.fLanguageCode),
-			fIcon(other.fIcon)
-		{}
-
+		LanguageListItem(const LanguageListItem& other);
 		~LanguageListItem();
 
-		const inline BString LanguageCode() { return fLanguageCode; }
+		const BString& LanguageCode() { return fLanguageCode; }
 		void DrawItem(BView *owner, BRect frame, bool complete = false);
 
 	private:
-		const BString fLanguageCode;
+		BString fLanguageCode;
 		BBitmap* fIcon;
 };
 
 
-static int
-compare_list_items(const void* _a, const void* _b)
-{
-	LanguageListItem* a = *(LanguageListItem**)_a;
-	LanguageListItem* b = *(LanguageListItem**)_b;
-	return strcasecmp(a->Text(), b->Text());
-}
-
-
 class LanguageListView: public BOutlineListView {
 	public:
 		LanguageListView(const char* name, list_view_type type);

src/preferences/locale/LocaleWindow.cpp

@@ -34,6 +34,15 @@
 #define TR_CONTEXT "Locale Preflet Window"
 
 
+static int
+compare_list_items(const void* _a, const void* _b)
+{
+	LanguageListItem* a = *(LanguageListItem**)_a;
+	LanguageListItem* b = *(LanguageListItem**)_b;
+	return strcasecmp(a->Text(), b->Text());
+}
+
+
 LocaleWindow::LocaleWindow()
 	:
 	BWindow(BRect(0, 0, 0, 0), "Locale", B_TITLED_WINDOW, B_NOT_RESIZABLE