Merge pull request #26128 from anntzer/tkt

timhoffm · web-flow · commit e8bcd91a94d9 · 2023-06-15T20:10:59.000+02:00
Add missing spacer in tk toolmanager toolbar.
diff --git a/lib/matplotlib/backends/_backend_tk.py b/lib/matplotlib/backends/_backend_tk.py
@@ -972,6 +972,13 @@ def __init__(self, toolmanager, window=None):
                           width=int(width), height=int(height),
                           borderwidth=2)
         self._label_font = tkinter.font.Font(size=10)
+        # This filler item ensures the toolbar is always at least two text
+        # lines high. Otherwise the canvas gets redrawn as the mouse hovers
+        # over images because those use two-line messages which resize the
+        # toolbar.
+        label = tk.Label(master=self, font=self._label_font,
+                         text='\N{NO-BREAK SPACE}\n\N{NO-BREAK SPACE}')
+        label.pack(side=tk.RIGHT)
         self._message = tk.StringVar(master=self)
         self._message_label = tk.Label(master=self, font=self._label_font,
                                        textvariable=self._message)
