ttk.Treeview删除所有项后标签名未销毁？如何批量清除标签配置？

现象复现 #

在ttk.Treeview中发现如下异常：按顺序点击Populate→TagConfigure→Reset→Populate按钮后，已被销毁的F2和F3项重新生成后仍显示红色。点击Reset按钮后的打印信息确认所有Treeview项已不存在，但标签配置依然生效。

复现该现象的测试代码：

import tkinter as tk
from tkinter import ttk

class App(ttk.Frame):

    def __init__(self, parent):
        super().__init__(parent)
        self.parent = parent
        self.top_iids = []
        self.child_iids = []
        self._create_widget()
        
    def _create_widget(self):
        self.tree = ttk.Treeview(
            self, height=10, selectmode='extended', takefocus=True,)
        self.tree.column('#0', stretch=True, width=200, anchor='w')
        self.tree.heading('#0', text="Col0", anchor='w')
        self.bn1 = ttk.Button(self, text="Populate", command=self.populate)        
        self.bn2 = ttk.Button(self, text="TagConfigure", command=self.tagconfig)
        self.bn3 = ttk.Button(self, text="Reset", command=self.reset)

        self.tree.grid(row=0, column=0, rowspan=4, padx=5, pady=5)
        self.bn1.grid(row=0, column=1, padx=5, pady=5)
        self.bn2.grid(row=1, column=1, padx=5, pady=5)
        self.bn3.grid(row=2, column=1, padx=5, pady=5)

    def populate(self):
        counter = 0
        for i in range(4):
            self.tree.tag_configure(i)
            tliid = f"G{i}"
            self.tree.insert("", "end", iid=tliid, open=True,
                             tags=[tliid], text=f"Restaurant {i}")
            ciid = f"F{counter}"
            self.tree.insert(tliid, "end", iid=ciid, text="Cookie", 
                             tags=[ciid], values=(ciid))
            self.top_iids.append(tliid)
            self.child_iids.append(ciid)
            counter+=1
            
    def tagconfig(self):
        self.tree.tag_configure('F2', foreground='red')
        self.tree.tag_configure('F3', foreground='red')

    def reset(self):
        print(f"def reset(self):")
        top_level_nodes = self.tree.get_children()
        self.tree.delete(*top_level_nodes)
        tln_exist = {i:self.tree.exists(i) for i in top_level_nodes}
        chn_exist = {i:self.tree.exists(i) for i in self.child_iids}
        print(f"{tln_exist=}")
        print(f"{chn_exist=}")
        
        # uncomment to make iids F2 & F3 black at 2nd press of Populate button
        # self.tree.tag_configure('F2', foreground='')
        # self.tree.tag_configure('F3', foreground='') 


if __name__ == '__main__':
    root = tk.Tk()
    app = App(root)
    app.pack(fill="both", expand=True)
    root.mainloop()

点击Reset按钮后的打印输出：

def reset(self):
tln_exist={'G0': False, 'G1': False, 'G2': False, 'G3': False}
chn_exist={'F0': False, 'F1': False, 'F2': False, 'F3': False}

临时修复方案 #

在self.reset()方法中添加以下代码，重置对应标签的前景色配置，可解决该问题：

self.tree.tag_configure('F2', foreground='')
self.tree.tag_configure('F3', foreground='')

疑问 #

根据ttk.Treeview.tag_configure(tagName, option=None, **kw)的文档说明，第一个参数为标签名，由此推测即使所有关联的Treeview项被销毁，F2和F3标签名及其配置仍会保留。基于此有两个疑问：

• 上述理解是否正确？
• 是否存在类似ttk.Treeview.delete(*items)的方法，可批量销毁旧标签名及其配置？

内容的提问来源于stack exchange，提问作者Sun Bear