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-rw-r--r--src/dispextern.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/dispextern.h b/src/dispextern.h
index fbb86f21359..22d2530244e 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -851,6 +851,10 @@ extern int fonts_changed_p;
extern struct glyph space_glyph;
+/* Frame being updated by update_window/update_frame. */
+
+extern struct frame *updating_frame;
+
/* Window being updated by update_window. This is non-null as long as
update_window has not finished, and null otherwise. It's role is
analogous to updating_frame. */