Issue #15587: merge from 3.2

Mac/IDLE/IDLE.app/Contents/Info.plist

@@ -53,5 +53,7 @@
 	<string>????</string>
 	<key>CFBundleVersion</key>
 	<string>%version%</string>
+	<key>NSHighResolutionCapable</key>
+	<true/>
 </dict>
 </plist>

Mac/Resources/app/Info.plist.in

@@ -56,5 +56,7 @@
 	<true/>
 	<key>NSHumanReadableCopyright</key>
 	<string>(c) 2013 Python Software Foundation.</string>
+	<key>NSHighResolutionCapable</key>
+	<true/>
 </dict>
 </plist>

Misc/NEWS

@@ -620,6 +620,10 @@ Build
 - Issue #15819: Make sure we can build Python out-of-tree from a read-only
   source directory.  (Somewhat related to issue #9860.)
 
+- Issue #15587: Enable Tk high-resolution text rendering on Macs with
+  Retina displays.  Applies to Tkinter apps, such as IDLE, on OS X
+  framework builds linked with Cocoa Tk 8.5.
+
 Tools/Demos
 -----------