patch 9.0.1044: setting window height using Python may cause errors

Problem:    Setting window height using Python may cause errors.
Solution:   When setting "curwin" also set "curbuf". (closes #11687)

src/if_py_both.h

@@ -4081,10 +4081,12 @@ WindowSetattr(WindowObject *self, char *name, PyObject *valObject)
 #endif
 	savewin = curwin;
 	curwin = self->win;
+	curbuf = curwin->w_buffer;
 
 	VimTryStart();
 	win_setheight((int) height);
 	curwin = savewin;
+	curbuf = curwin->w_buffer;
 	if (VimTryEnd())
 	    return -1;
 
@@ -4103,10 +4105,12 @@ WindowSetattr(WindowObject *self, char *name, PyObject *valObject)
 #endif
 	savewin = curwin;
 	curwin = self->win;
+	curbuf = curwin->w_buffer;
 
 	VimTryStart();
 	win_setwidth((int) width);
 	curwin = savewin;
+	curbuf = curwin->w_buffer;
 	if (VimTryEnd())
 	    return -1;
 

src/testdir/test_python3.vim

@@ -540,6 +540,24 @@ func Test_python3_window()
   %bw!
 endfunc
 
+" This was causing trouble because "curbuf" was not matching curwin->w_buffer
+func Test_python3_window_set_height()
+  enew!
+  call setline(1, ['aaa', 'bbb', 'ccc'])
+  call cursor(2, 1)
+  set foldmethod=expr
+  new
+  wincmd w
+  python3 vim.windows[0].height = 5
+  call assert_equal(5, winheight(1))
+
+  call feedkeys('j', 'xt')
+  call assert_equal(3, getpos('.')[1])
+
+  bwipe!
+  bwipe!
+endfunc
+
 " Test for the python List object
 func Test_python3_list()
   " Try to convert a null List

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1044,
 /**/
     1043,
 /**/