Tk Drag and Drop 是 Tcl/Tk 的一个扩展，用来实现拖放功能，基于 Tk 8.3.3 或者更高版本。支持包括 Windows\Mac\Linux 内嵌的拖放操作。
TkDND 2.6 发布，主要改进记录：
- Improved support for accepting drops under Linux.
- TkDND periodically checks if the selection can be retrieved, even if SelectionNotify has not been delivered to the Tk widget by Tk.
- This release offers support for both dragging and dropping under all 3 major operating systems (Windows, OS X, Linux)
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