vim-patch:9.0.1597: cursor ends up below the window after a put

Problem:    Cursor ends up below the window after a put.
Solution:   Mark w_crow and w_botline invalid when changing the cursor line.
            (closes vim/vim#12465)

8509014add

Co-authored-by: Bram Moolenaar <Bram@vim.org>

src/nvim/eval.c

@@ -6511,6 +6511,10 @@ pos_T *var2fpos(const typval_T *const tv, const bool dollar_lnum, int *const ret
   pos.coladd = 0;
 
   if (name[0] == 'w' && dollar_lnum) {
+    // the "w_valid" flags are not reset when moving the cursor, but they
+    // do matter for update_topline() and validate_botline().
+    check_cursor_moved(curwin);
+
     pos.col = 0;
     if (name[1] == '0') {               // "w0": first visible line
       update_topline(curwin);

src/nvim/move.c

@@ -548,18 +548,20 @@ void set_topline(win_T *wp, linenr_T lnum)
   redraw_later(wp, UPD_VALID);
 }
 
-// Call this function when the length of the cursor line (in screen
-// characters) has changed, and the change is before the cursor.
-// Need to take care of w_botline separately!
+/// Call this function when the length of the cursor line (in screen
+/// characters) has changed, and the change is before the cursor.
+/// If the line length changed the number of screen lines might change,
+/// requiring updating w_topline.  That may also invalidate w_crow.
+/// Need to take care of w_botline separately!
 void changed_cline_bef_curs(void)
 {
-  curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
+  curwin->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
                        |VALID_CHEIGHT|VALID_TOPLINE);
 }
 
 void changed_cline_bef_curs_win(win_T *wp)
 {
-  wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL
+  wp->w_valid &= ~(VALID_WROW|VALID_WCOL|VALID_VIRTCOL|VALID_CROW
                    |VALID_CHEIGHT|VALID_TOPLINE);
 }
 

src/nvim/ops.c

@@ -3484,6 +3484,7 @@ void do_put(int regname, yankreg_T *reg, int dir, long count, int flags)
           if (lnum == curwin->w_cursor.lnum) {
             // make sure curwin->w_virtcol is updated
             changed_cline_bef_curs();
+            invalidate_botline();
             curwin->w_cursor.col += (colnr_T)(totlen - 1);
           }
           changed_bytes(lnum, col);

test/functional/legacy/put_spec.lua

@@ -70,4 +70,29 @@ describe('put', function()
                                                                                       |
     ]])
   end)
+
+  -- oldtest: Test_put_in_last_displayed_line()
+  it('in last displayed line', function()
+    local screen = Screen.new(75, 10)
+    screen:attach()
+    source([[
+      autocmd CursorMoved * eval line('w$')
+      let @a = 'x'->repeat(&columns * 2 - 2)
+      eval range(&lines)->setline(1)
+      call feedkeys('G"ap')
+    ]])
+
+    screen:expect([[
+      2                                                                          |
+      3                                                                          |
+      4                                                                          |
+      5                                                                          |
+      6                                                                          |
+      7                                                                          |
+      8                                                                          |
+      9xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx|
+      xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx^x |
+                                                                                 |
+    ]])
+  end)
 end)

test/old/testdir/test_put.vim

@@ -266,5 +266,23 @@ func Test_put_other_window()
   call VerifyScreenDump(buf, 'Test_put_other_window_1', {})
 
   call StopVimInTerminal(buf)
+endfunc
+
+func Test_put_in_last_displayed_line()
+  CheckRunVimInTerminal
+
+  let lines =<< trim END
+      vim9script
+      autocmd CursorMoved * eval line('w$')
+      @a = 'x'->repeat(&columns * 2 - 2)
+      range(&lines)->setline(1)
+      feedkeys('G"ap')
+  END
+  call writefile(lines, 'Xtest_put_last_line', 'D')
+  let buf = RunVimInTerminal('-S Xtest_put_last_line', #{rows: 10})
+
+  call VerifyScreenDump(buf, 'Test_put_in_last_displayed_line_1', {})
+
+  call StopVimInTerminal(buf)
 endfunc