patch 8.1.1262: cannot simulate a mouse click in a test

Problem:    Cannot simulate a mouse click in a test.
Solution:   Add test_setmouse().
diff --git a/src/evalfunc.c b/src/evalfunc.c
index 2b1b142..7b6785c 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -456,6 +456,7 @@
 #ifdef FEAT_GUI
 static void f_test_scrollbar(typval_T *argvars, typval_T *rettv);
 #endif
+static void f_test_setmouse(typval_T *argvars, typval_T *rettv);
 static void f_test_settime(typval_T *argvars, typval_T *rettv);
 #ifdef FEAT_FLOAT
 static void f_tan(typval_T *argvars, typval_T *rettv);
@@ -993,6 +994,7 @@
 #ifdef FEAT_GUI
     {"test_scrollbar",	3, 3, f_test_scrollbar},
 #endif
+    {"test_setmouse",	2, 2, f_test_setmouse},
     {"test_settime",	1, 1, f_test_settime},
 #ifdef FEAT_TIMERS
     {"timer_info",	0, 1, f_timer_info},
@@ -14494,6 +14496,13 @@
 #endif
 
     static void
+f_test_setmouse(typval_T *argvars, typval_T *rettv UNUSED)
+{
+    mouse_row = (time_t)tv_get_number(&argvars[0]) - 1;
+    mouse_col = (time_t)tv_get_number(&argvars[1]) - 1;
+}
+
+    static void
 f_test_settime(typval_T *argvars, typval_T *rettv UNUSED)
 {
     time_for_testing = (time_t)tv_get_number(&argvars[0]);
diff --git a/src/version.c b/src/version.c
index d78ef3d..07f3962 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1262,
+/**/
     1261,
 /**/
     1260,