patch 9.0.1533: test for 'smoothscroll' is ineffective

Problem:    Test for 'smoothscroll' is ineffective.
Solution:   Change the order of testing "zb" and "zt". (Luuk van Baal,
            closes #12366)
diff --git a/src/testdir/dumps/Test_smooth_long_11.dump b/src/testdir/dumps/Test_smooth_long_11.dump
index 0aa7a4b..62d7992 100644
--- a/src/testdir/dumps/Test_smooth_long_11.dump
+++ b/src/testdir/dumps/Test_smooth_long_11.dump
@@ -1,6 +1,6 @@
-|<+0#4040ff13#ffffff0@2|t+0#0000000&|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t
-|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o
-|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o
-|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |e|n|d| @11
->f|o|u|r| @35
-|:|s|e|t| |s|c|r|o|l@1|o| @9|4|,|1| @10|B|o|t| 
+>f+0&#ffffff0|o|u|r| @35
+|~+0#4040ff13&| @38
+|~| @38
+|~| @38
+|~| @38
+| +0#0000000&@21|4|,|1| @10|B|o|t| 
diff --git a/src/testdir/dumps/Test_smooth_long_12.dump b/src/testdir/dumps/Test_smooth_long_12.dump
index 10634be..7a1245e 100644
--- a/src/testdir/dumps/Test_smooth_long_12.dump
+++ b/src/testdir/dumps/Test_smooth_long_12.dump
@@ -3,4 +3,4 @@
 >f|o|u|r| @35
 |~+0#4040ff13&| @38
 |~| @38
-|:+0#0000000&|s|e|t| |s|c|r|o|l@1|o| @9|4|,|1| @10|B|o|t| 
+| +0#0000000&@21|4|,|1| @10|B|o|t| 
diff --git a/src/testdir/dumps/Test_smooth_long_13.dump b/src/testdir/dumps/Test_smooth_long_13.dump
index 62d7992..7f5bff7 100644
--- a/src/testdir/dumps/Test_smooth_long_13.dump
+++ b/src/testdir/dumps/Test_smooth_long_13.dump
@@ -1,6 +1,6 @@
->f+0&#ffffff0|o|u|r| @35
-|~+0#4040ff13&| @38
-|~| @38
-|~| @38
-|~| @38
-| +0#0000000&@21|4|,|1| @10|B|o|t| 
+|<+0#4040ff13#ffffff0@2|t+0#0000000&|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t
+|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o
+|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o
+|f| |t|e|x|t| |w|i|t|h| |l|o|t|s| |o|f| |t|e|x|t| |e|n|d| @11
+>f|o|u|r| @35
+@22|4|,|1| @10|B|o|t| 
diff --git a/src/testdir/test_scroll_opt.vim b/src/testdir/test_scroll_opt.vim
index 5f6fefe..62469de 100644
--- a/src/testdir/test_scroll_opt.vim
+++ b/src/testdir/test_scroll_opt.vim
@@ -323,11 +323,11 @@
   call VerifyScreenDump(buf, 'Test_smooth_long_10', {})
 
   " Test zt/zz/zb that they work properly when a long line is above it
-  call term_sendkeys(buf, "zb")
+  call term_sendkeys(buf, "zt")
   call VerifyScreenDump(buf, 'Test_smooth_long_11', {})
   call term_sendkeys(buf, "zz")
   call VerifyScreenDump(buf, 'Test_smooth_long_12', {})
-  call term_sendkeys(buf, "zt")
+  call term_sendkeys(buf, "zb")
   call VerifyScreenDump(buf, 'Test_smooth_long_13', {})
 
   " Repeat the step and move the cursor down again.
diff --git a/src/version.c b/src/version.c
index 3fb73b2..97530bf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1533,
+/**/
     1532,
 /**/
     1531,