gh-120083: Add IDLE Hovertip foreground color needed for recent macOS (#120605)

On recent versions of macOS (sometime between Catalina and Sonoma 14.5), the default Hovertip foreground color changed from black to white, thereby matching the background. This might be a matter of matching the white foreground of the dark-mode text. The unreadable result is shown here (#120083 (comment)).

The foreground and background colors were made parameters so we can pass different colors for future additional hovertips in IDLE.
---------

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>

Lib/idlelib/News3.txt

@@ -4,6 +4,10 @@ Released on 2024-10-xx
 =========================
 
 
+gh-120083: Add explicit black IDLE Hovertip foreground color needed for
+recent macOS. Fixes Sonoma showing unreadable white on pale yellow.
+Patch by John Riggles.
+
 gh-122482: Change About IDLE to direct users to discuss.python.org
 instead of the now unused idle-dev email and mailing list.
 

Lib/idlelib/tooltip.py

@@ -144,7 +144,8 @@ class OnHoverTooltipBase(TooltipBase):
 
 class Hovertip(OnHoverTooltipBase):
     "A tooltip that pops up when a mouse hovers over an anchor widget."
-    def __init__(self, anchor_widget, text, hover_delay=1000):
+    def __init__(self, anchor_widget, text, hover_delay=1000,
+                 foreground="#000000", background="#ffffe0"):
         """Create a text tooltip with a mouse hover delay.
 
         anchor_widget: the widget next to which the tooltip will be shown
@@ -156,10 +157,13 @@ class Hovertip(OnHoverTooltipBase):
         """
         super().__init__(anchor_widget, hover_delay=hover_delay)
         self.text = text
+        self.foreground = foreground
+        self.background = background
 
     def showcontents(self):
         label = Label(self.tipwindow, text=self.text, justify=LEFT,
-                      background="#ffffe0", relief=SOLID, borderwidth=1)
+                       relief=SOLID,  borderwidth=1,
+                       foreground=self.foreground, background=self.background)
         label.pack()
 
 

Misc/NEWS.d/next/IDLE/2024-06-16-21-42-45.gh-issue-120083.nczuyv.rst

@@ -0,0 +1 @@
+Add explicit black IDLE Hovertip foreground color needed for recent macOS.  Fixes Sonoma showing unreadable white on pale yellow.  Patch by John Riggles.