patch 8.1.1517: when a popup changes all windows are redrawn

Problem:    When a popup changes all windows are redrawn.
Solution:   Only update the lines that were affected.  Add a file for
            profiling popup windows efficiency.
diff --git a/Filelist b/Filelist
index 7bf4fd6..99e1004 100644
--- a/Filelist
+++ b/Filelist
@@ -152,6 +152,7 @@
 		src/testdir/if_ver*.vim \
 		src/testdir/color_ramp.vim \
 		src/testdir/silent.wav \
+		src/testdir/popupbounce.vim \
 		src/proto.h \
 		src/protodef.h \
 		src/proto/arabic.pro \