From 2e847608b049b42fd6f4e249d7574b28df863e06 Mon Sep 17 00:00:00 2001
From: fvogel <fvogelnew1@free.fr>
Date: Fri, 14 Jul 2023 19:25:25 +0000
Subject: OBJOFFSET VS. INTERNALOFFSET: Document that Ttk widgets do not
 support the internalOffset machinery.

---
 doc/SetOptions.3 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/doc/SetOptions.3 b/doc/SetOptions.3
index 08d5342..53b289f 100644
--- a/doc/SetOptions.3
+++ b/doc/SetOptions.3
@@ -533,6 +533,10 @@ To implement a new type of option, you can use \fBTK_OPTION_STRING\fR as
 the type in the Tk_OptionSpec structure and set the \fIobjOffset\fR field
 but not the \fIinternalOffset\fR field.  Then, after calling
 \fBTk_SetOptions\fR, convert the object to internal form yourself.
+.PP
+Ttk widgets do not support the \fIinternalOffset\fR machinery.
+Option values of Ttk widgets are always stored as (Tcl_Obj *), meaning that
+the \fIobjOffset\fR field must be used.
 .SH "CUSTOM OPTION TYPES"
 .PP
 Applications can extend the built-in configuration types with
-- 
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