Patch 8.1.1137
Problem:    Xterm mouse wheel escape sequence is not tested.
Solution:   Add a test using low-level input. (Dominique Pelle, closes #4221)
Files:      src/testdir/test_termcodes.vim


*** ../vim-8.1.1136/src/testdir/test_termcodes.vim      2019-04-07 
14:21:26.226339351 +0200
--- src/testdir/test_termcodes.vim      2019-04-07 21:52:38.692856529 +0200
***************
*** 45,47 ****
--- 45,113 ----
    bwipe!
  endfunc
  
+ func Test_xterm_mouse_wheel()
+   new
+   let save_mouse = &mouse
+   let save_term = &term
+   let save_ttymouse = &ttymouse
+   set mouse=a
+   set term=xterm
+   call setline(1, range(1, 100))
+ 
+   " Test Xterm mouse wheel.
+   set ttymouse=xterm
+   let button = 0x41 " wheel down.
+   let row = 1 + 32  " cursor position for mouse wheel is not relevant.
+   let col = 1 + 32
+ 
+   call assert_equal(1, line('w0'))
+   call assert_equal([0, 1, 1, 0], getpos('.'))
+   call feedkeys("\<Esc>[M" .. list2str([button, col, row]), 'Lx!')
+   call assert_equal(4, line('w0'))
+   call assert_equal([0, 4, 1, 0], getpos('.'))
+   call feedkeys("\<Esc>[M" .. list2str([button, col, row]), 'Lx!')
+   call assert_equal(7, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+ 
+   let button = 0x40  " wheel up.
+ 
+   call feedkeys("\<Esc>[M" .. list2str([button, col, row]), 'Lx!')
+   call assert_equal(4, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+   call feedkeys("\<Esc>[M" .. list2str([button, col, row]), 'Lx!')
+   call assert_equal(1, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+ 
+   " Test SGR mouse wheel.
+   set ttymouse=sgr
+   go
+   let button = 0x41 " wheel down.
+   let row = 1       " cursor position for mouse wheel is not relevant.
+   let col = 1
+ 
+   call assert_equal(1, line('w0'))
+   call assert_equal([0, 1, 1, 0], getpos('.'))
+   call feedkeys(printf("\<Esc>[<%d;%d;%dM", button, col, row), 'Lx!')
+   call assert_equal(4, line('w0'))
+   call assert_equal([0, 4, 1, 0], getpos('.'))
+   call feedkeys(printf("\<Esc>[<%d;%d;%dM", button, col, row), 'Lx!')
+   call assert_equal(7, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+ 
+   let button = 0x40  " wheel up.
+ 
+   call feedkeys(printf("\<Esc>[<%d;%d;%dM", button, col, row), 'Lx!')
+   call assert_equal(4, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+   call feedkeys(printf("\<Esc>[<%d;%d;%dM", button, col, row), 'Lx!')
+   call assert_equal(1, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+   call feedkeys(printf("\<Esc>[<%d;%d;%dM", button, col, row), 'Lx!')
+   call assert_equal(1, line('w0'))
+   call assert_equal([0, 7, 1, 0], getpos('.'))
+ 
+   let &mouse = save_mouse
+   let &term = save_term
+   let &ttymouse = save_ttymouse
+   bwipe!
+ endfunc
*** ../vim-8.1.1136/src/version.c       2019-04-07 14:21:26.230339328 +0200
--- src/version.c       2019-04-07 21:53:40.908539048 +0200
***************
*** 773,774 ****
--- 773,776 ----
  {   /* Add new patch number below this line */
+ /**/
+     1137,
  /**/

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