vim-patch:9.0.0071: command overlaps with printed text in scrollback (#19505)

Problem:    Command overlaps with printed text in scrollback.
Solution:   Clear until end-of-line and use correct message chunk.
            (closes vim/vim#10765, closes vim/vim#10764)
ecdc82e74e

N/A patches for version.c:

vim-patch:9.0.0070: using utfc_ptr2char_len() when length is negative

Problem:    Using utfc_ptr2char_len() when length is negative.
Solution:   Check value of length. (closes vim/vim#10760)
4dc513a22c

test/functional/legacy/messages_spec.lua

@@ -199,11 +199,11 @@ describe('messages', function()
       -- Up all the way with 'g'.
       feed('g')
       screen:expect([[
+        :%p#                                                                       |
         {2:  1 }1                                                                      |
         {2:  2 }2                                                                      |
         {2:  3 }3                                                                      |
         {2:  4 }4                                                                      |
-        {2:  5 }5                                                                      |
         {1:-- More --}^                                                                 |
       ]])