bpo-40128: Fix IDLE autocomplete on macOS (GH-26672)

thsubaku9 · terryjreedy · web-flow · commit 3ec3ee7d2e9b · 2021-06-11T18:55:32.000-04:00
In particular, when running with tk8.6.8, as in PSF 3.9. 

Co-authored-by: Terry Jan Reedy &lt;tjreedy@udel.edu&gt;
diff --git a/Lib/idlelib/autocomplete_w.py b/Lib/idlelib/autocomplete_w.py
@@ -206,6 +206,7 @@ def show_window(self, comp_lists, index, complete, mode, userWantsWin):
         scrollbar.config(command=listbox.yview)
         scrollbar.pack(side=RIGHT, fill=Y)
         listbox.pack(side=LEFT, fill=BOTH, expand=True)
+        acw.update_idletasks() # Need for tk8.6.8 on macOS: #40128.
         acw.lift()  # work around bug in Tk 8.5.18+ (issue #24570)
 
         # Initialize the listbox selection
diff --git a/Misc/NEWS.d/next/IDLE/2021-06-11-17-43-39.bpo-40128.7vDN3U.rst b/Misc/NEWS.d/next/IDLE/2021-06-11-17-43-39.bpo-40128.7vDN3U.rst
@@ -0,0 +1,3 @@
+Mostly fix completions on macOS when not using tcl/tk 8.6.11 (as with 3.9).
+The added update_idletask call should be harmless and possibly helpful
+otherwise.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+Mostly fix completions on macOS when not using tcl/tk 8.6.11 (as with 3.9).`
	`2`	`+The added update_idletask call should be harmless and possibly helpful`
	`3`	`+otherwise.`