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-rw-r--r--src/lisp.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/lisp.h b/src/lisp.h
index eed57048871..11337645e54 100644
--- a/src/lisp.h
+++ b/src/lisp.h
@@ -677,6 +677,8 @@ typedef unsigned char UCHAR;
/* Return a glyph's face ID. */
#define GLYPH_FACE(glyph) (((glyph) >> 8) & ((1 << 24) - 1))
+/* The ID of the mode line highlighting face. */
+#define GLYPH_MODE_LINE_FACE 1
/* Data type checking */