[3.12] gh-119174: Fix high DPI causes turtledemo(turtle-graphics examples) windows blurry (GH-119175) (#119290)

gh-119174: Fix high DPI causes turtledemo(turtle-graphics examples) windows blurry (GH-119175)

------

(cherry picked from commit 538ed5e4818aa0d0aa759634e8bfa23e317434a1)

Co-authored-by: Wulian233 <71213467+Wulian233@users.noreply.github.com>

3 files changed, 19 insertions, 9 deletions

diff --git a/Lib/idlelib/config.py b/Lib/idlelib/config.py
index 7fc08ef..6a5acac 100644
--- a/Lib/idlelib/config.py
+++ b/Lib/idlelib/config.py
@@ -158,8 +158,9 @@ class IdleConf:
         self.defaultCfg = {}
         self.userCfg = {}
         self.cfg = {}  # TODO use to select userCfg vs defaultCfg
+
+        # See https://bugs.python.org/issue4630#msg356516 for following.
         # self.blink_off_time = <first editor text>['insertofftime']
-        # See https://bugs.python.org/issue4630#msg356516.
 
         if not _utest:
             self.CreateConfigHandlers()
diff --git a/Lib/idlelib/pyshell.py b/Lib/idlelib/pyshell.py
index 1524fcc..d8b2652 100755
--- a/Lib/idlelib/pyshell.py
+++ b/Lib/idlelib/pyshell.py
@@ -11,15 +11,9 @@ except ImportError:
           "Your Python may not be configured for Tk. **", file=sys.__stderr__)
     raise SystemExit(1)
 
-# Valid arguments for the ...Awareness call below are defined in the following.
-# https://msdn.microsoft.com/en-us/library/windows/desktop/dn280512(v=vs.85).aspx
 if sys.platform == 'win32':
-    try:
-        import ctypes
-        PROCESS_SYSTEM_DPI_AWARE = 1  # Int required.
-        ctypes.OleDLL('shcore').SetProcessDpiAwareness(PROCESS_SYSTEM_DPI_AWARE)
-    except (ImportError, AttributeError, OSError):
-        pass
+    from idlelib.util import fix_win_hidpi
+    fix_win_hidpi()
 
 from tkinter import messagebox
 
diff --git a/Lib/idlelib/util.py b/Lib/idlelib/util.py
index a7ae74b..e05604a 100644
--- a/Lib/idlelib/util.py
+++ b/Lib/idlelib/util.py
@@ -12,11 +12,26 @@ TODO:
     * std streams (pyshell, run),
     * warning stuff (pyshell, run).
 """
+import sys
 
 # .pyw is for Windows; .pyi is for typing stub files.
 # The extension order is needed for iomenu open/save dialogs.
 py_extensions = ('.py', '.pyw', '.pyi')
 
+
+# Fix for HiDPI screens on Windows.  CALL BEFORE ANY TK OPERATIONS!
+# URL for arguments for the ...Awareness call below.
+# https://msdn.microsoft.com/en-us/library/windows/desktop/dn280512(v=vs.85).aspx
+if sys.platform == 'win32':  # pragma: no cover
+    def fix_win_hidpi():  # Called in pyshell and turtledemo.
+        try:
+            import ctypes
+            PROCESS_SYSTEM_DPI_AWARE = 1  # Int required.
+            ctypes.OleDLL('shcore').SetProcessDpiAwareness(PROCESS_SYSTEM_DPI_AWARE)
+        except (ImportError, AttributeError, OSError):
+            pass
+
+
 if __name__ == '__main__':
     from unittest import main
     main('idlelib.idle_test.test_util', verbosity=2)