[LyX/master] Fix lyx2lyx conversion roundtrip problem

[Koji Yokota]

commit 7b10e9a6e68086785cd0b4551a9d93c272c5e3fd
Author: Koji Yokota <yokota at lyx.org>
Date:   Tue Aug 4 14:56:48 2026 +0900

    Fix lyx2lyx conversion roundtrip problem
    
    https://lists.lyx.org/pipermail/lyx-devel/2026-August/017067.html
    
    Thanks to Pavel and Scott.
---
 lib/lyx2lyx/lyx_2_6.py | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/lyx2lyx/lyx_2_6.py b/lib/lyx2lyx/lyx_2_6.py
index 9c2eb4c634..7302e78b02 100644
--- a/lib/lyx2lyx/lyx_2_6.py
+++ b/lib/lyx2lyx/lyx_2_6.py
@@ -47,7 +47,6 @@ from lyx2lyx_tools import (
 #    del_value,
 #    find_complete_lines, 
 #    find_end_of,
-#    find_token_exact,
 #    find_tokens,
 #    get_option_value,
 #    set_bool_value,
@@ -61,6 +60,7 @@ from parser_tools import (
     find_substring,
     find_token,
     find_token_backwards,
+    find_token_exact,
     get_bool_value,
     get_containing_inset,
     get_containing_layout,
@@ -1570,7 +1570,7 @@ def revert_hex32colors(document):
     """Revert 32bit ARGB hex colors to 16bit RGB"""
     i = 0
     while True:
-        i = find_token(document.header, "\\color", i + 1)
+        i = find_token_exact(document.header, "\\color", i + 1)
         if i == -1:
             break
         cn = get_quoted_value(document.header, "\\color", i, i + 1)
@@ -1590,7 +1590,7 @@ def revert_hex32colors(document):
 
     i = 0
     while True:
-        i = find_token(document.body, "\\color", i + 1)
+        i = find_token_exact(document.body, "\\color", i + 1)
         if i == -1:
             return
         cn = get_quoted_value(document.body, "\\color", i, i + 1)