Issue #20406: Use Python application icons for Idle window title bars.

Patch mostly by Serhiy Storchaka.

Lib/idlelib/PyShell.py

@@ -16,7 +16,7 @@ import io
 
 import linecache
 from code import InteractiveInterpreter
-from platform import python_version
+from platform import python_version, system
 
 try:
     from tkinter import *
@@ -1524,6 +1524,18 @@ def main():
     # start editor and/or shell windows:
     root = Tk(className="Idle")
 
+    # set application icon
+    icondir = os.path.join(os.path.dirname(__file__), 'Icons')
+    if system() == 'Windows':
+        iconfile = os.path.join(icondir, 'idle.ico')
+        root.wm_iconbitmap(default=iconfile)
+    elif TkVersion >= 8.5:
+        ext = '.png' if TkVersion >= 8.6 else '.gif'
+        iconfiles = [os.path.join(icondir, 'idle_%d%s' % (size, ext))
+                     for size in (16, 32, 48)]
+        icons = [PhotoImage(file=iconfile) for iconfile in iconfiles]
+        root.wm_iconphoto(True, *icons)
+
     fixwordbreaks(root)
     root.withdraw()
     flist = PyShellFileList(root)

Misc/NEWS

@@ -316,6 +316,9 @@ Library
 IDLE
 ----
 
+- Issue #20406: Use Python application icons for Idle window title bars.
+  Patch mostly by Serhiy Storchaka.
+
 - Update the python.gif icon for the Idle classbrowser and pathbowser
   from the old green snake to the new new blue and yellow snakes.