Alt-H was conflicting with the Help menu on Windows.

kbkaiser · kbkaiser · commit 710fa6c6df9d · 2002-12-23T03:35:27.000Z
Let's try Alt-2....
diff --git a/Lib/idlelib/config-extensions.def b/Lib/idlelib/config-extensions.def
@@ -26,7 +26,7 @@ expand-word=<Alt-Key-slash>
 [ZoomHeight]
 enable=1
 [ZoomHeight_cfgBindings]
-zoom-height=<Alt-Key-h>
+zoom-height=<Alt-Key-2>
 
 [ScriptBinding]
 enable=1
