Add items to MISC/NEWS and idlelib/NEWS.txt.

Lib/idlelib/NEWS.txt

+What's New in IDLE 3.5.2?
+=========================
+*Release date: 2016-06-30?*
+
+- Issue #27117: Make colorizer htest and turtledemo work with dark themes.
+  Move code for configuring text widget colors to a new function.
+
+- Issue #26673: When tk reports font size as 0, change to size 10.
+  Such fonts on Linux prevented the configuration dialog from opening.
+
+- Issue #21939: Add test for IDLE's percolator.
+  Original patch by Saimadhav Heblikar.
+
+- Issue #21676: Add test for IDLE's replace dialog.
+  Original patch by Saimadhav Heblikar.
+
+- Issue #18410: Add test for IDLE's search dialog.
+  Original patch by Westley Martínez.
+
+- Issue #21703: Add test for undo delegator.
+  Original patch by Saimadhav Heblikar .
+
+- Issue #27044: Add ConfigDialog.remove_var_callbacks to stop memory leaks.
+
+- Issue #23977: Add more asserts to test_delegator.
+
+- Issue #20640: Add tests for idlelib.configHelpSourceEdit.
+  Patch by Saimadhav Heblikar.
+
+- In the 'IDLE-console differences' section of the IDLE doc, clarify
+  how running with IDLE affects sys.modules and the standard streams.
+
+- Issue #25507: fix incorrect change in IOBinding that prevented printing.
+  Augment IOBinding htest to include all major IOBinding functions.
+
+- Issue #25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
+  MARK in README.txt and open this and NEWS.txt with 'ascii'.
+  Re-encode CREDITS.txt to utf-8 and open it with 'utf-8'.
+
+
 What's New in IDLE 3.5.1?
 =========================
 *Release date: 2015-12-06*

Misc/NEWS

@@ -471,6 +471,44 @@ Library
 
 - Issue #27041: asyncio: Add loop.create_future method
 
+IDLE
+----
+
+- Issue #27117: Make colorizer htest and turtledemo work with dark themes.
+  Move code for configuring text widget colors to a new function.
+
+- Issue #26673: When tk reports font size as 0, change to size 10.
+  Such fonts on Linux prevented the configuration dialog from opening.
+
+- Issue #21939: Add test for IDLE's percolator.
+  Original patch by Saimadhav Heblikar.
+
+- Issue #21676: Add test for IDLE's replace dialog.
+  Original patch by Saimadhav Heblikar.
+
+- Issue #18410: Add test for IDLE's search dialog.
+  Original patch by Westley Martínez.
+
+- Issue #21703: Add test for IDLE's undo delegator.
+  Original patch by Saimadhav Heblikar .
+
+- Issue #27044: Add ConfigDialog.remove_var_callbacks to stop memory leaks.
+
+- Issue #23977: Add more asserts to test_delegator.
+
+- Issue #20640: Add tests for idlelib.configHelpSourceEdit.
+  Patch by Saimadhav Heblikar.
+
+- In the 'IDLE-console differences' section of the IDLE doc, clarify
+  how running with IDLE affects sys.modules and the standard streams.
+
+- Issue #25507: fix incorrect change in IOBinding that prevented printing.
+  Augment IOBinding htest to include all major IOBinding functions.
+
+- Issue #25905: Revert unwanted conversion of ' to ’ RIGHT SINGLE QUOTATION
+  MARK in README.txt and open this and NEWS.txt with 'ascii'.
+  Re-encode CREDITS.txt to utf-8 and open it with 'utf-8'.
+
 Documentation
 -------------