Give the Help viewer a font-size button. This isn't documented by MS,
but is documented by others on the web, and the defn of the magic flag
needed appears in MS's htmlhelp.h header file.
diff --git a/Doc/tools/prechm.py b/Doc/tools/prechm.py
index 970ed34..2891a89 100644
--- a/Doc/tools/prechm.py
+++ b/Doc/tools/prechm.py
@@ -36,6 +36,35 @@
# the 2.2 in Python 2.2).
# The magical numbers in the long line under [WINDOWS] set most of the
# user-visible features (visible buttons, tabs, etc).
+# About 0x10384e: This defines the buttons in the help viewer. The
+# following defns are taken from htmlhelp.h. Not all possibilities
+# actually work, and not all those that work are available from the Help
+# Workshop GUI. In particular, the Zoom/Font button works and is not
+# available from the GUI. The ones we're using are marked with 'x':
+#
+# 0x000002 Hide/Show x
+# 0x000004 Back x
+# 0x000008 Forward x
+# 0x000010 Stop
+# 0x000020 Refresh
+# 0x000040 Home x
+# 0x000080 Forward
+# 0x000100 Back
+# 0x000200 Notes
+# 0x000400 Contents
+# 0x000800 Locate x
+# 0x001000 Options x
+# 0x002000 Print x
+# 0x004000 Index
+# 0x008000 Search
+# 0x010000 History
+# 0x020000 Favorites
+# 0x040000 Jump 1
+# 0x080000 Jump 2
+# 0x100000 Zoom/Font x
+# 0x200000 TOC Next
+# 0x400000 TOC Prev
+
project_template = '''
[OPTIONS]
Compiled file=%(arch)s.chm
@@ -51,7 +80,7 @@
[WINDOWS]
%(arch)s="Python %(version)s Documentation","%(arch)s.hhc","%(arch)s.hhk",\
-"index.html","index.html",,,,,0x63520,220,0x384e,[271,372,740,718],,,,,,,0
+"index.html","index.html",,,,,0x63520,220,0x10384e,[271,372,740,718],,,,,,,0
[FILES]
'''