fix(api/buffer): fix handling of viewport of non-current buffer

A lot of functions in move.c only worked for curwin, alternatively
took a `wp` arg but still only work if that happens to be curwin.

Refactor those that are needed for update_topline(wp) to work
for any window.

fixes #27723
fixes #27720

1 files changed, 3 insertions, 3 deletions

diff --git a/src/nvim/change.c b/src/nvim/change.c
index 8b1e7587de..673907fa27 100644
--- a/src/nvim/change.c
+++ b/src/nvim/change.c
@@ -707,7 +707,7 @@ void ins_char(int c)
 void ins_char_bytes(char *buf, size_t charlen)
 {
   // Break tabs if needed.
-  if (virtual_active() && curwin->w_cursor.coladd > 0) {
+  if (virtual_active(curwin) && curwin->w_cursor.coladd > 0) {
     coladvance_force(getviscol());
   }
 
@@ -815,7 +815,7 @@ void ins_str(char *s)
   int newlen = (int)strlen(s);
   linenr_T lnum = curwin->w_cursor.lnum;
 
-  if (virtual_active() && curwin->w_cursor.coladd > 0) {
+  if (virtual_active(curwin) && curwin->w_cursor.coladd > 0) {
     coladvance_force(getviscol());
   }
 
@@ -918,7 +918,7 @@ int del_bytes(colnr_T count, bool fixpos_arg, bool use_delcombine)
     // fixpos is true, we don't want to end up positioned at the NUL,
     // unless "restart_edit" is set or 'virtualedit' contains "onemore".
     if (col > 0 && fixpos && restart_edit == 0
-        && (get_ve_flags() & VE_ONEMORE) == 0) {
+        && (get_ve_flags(curwin) & VE_ONEMORE) == 0) {
       curwin->w_cursor.col--;
       curwin->w_cursor.coladd = 0;
       curwin->w_cursor.col -= utf_head_off(oldp, oldp + curwin->w_cursor.col);