vim-patch:9.1.0155: can only get getregion() from current buffer (#27757)

Problem:  can only call getregion() for current buffer
Solution: Allow to retrieve selections from different buffers
          (Shougo Matsushita)

closes: vim/vim#14131

https://github.com/vim/vim/commit/84bf6e658da51126bdd2e50af1f40cabd149343f

Co-authored-by: Shougo Matsushita <Shougo.Matsu@gmail.com>

1 files changed, 22 insertions, 10 deletions

diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index 605170610c..67443b66bc 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -2827,16 +2827,12 @@ static void f_getregion(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
     return;
   }
 
-  int fnum = -1;
-  pos_T p1;
-  if (list2fpos(&argvars[0], &p1, &fnum, NULL, false) != OK
-      || (fnum >= 0 && fnum != curbuf->b_fnum)) {
-    return;
-  }
-
-  pos_T p2;
-  if (list2fpos(&argvars[1], &p2, &fnum, NULL, false) != OK
-      || (fnum >= 0 && fnum != curbuf->b_fnum)) {
+  int fnum1 = -1;
+  int fnum2 = -1;
+  pos_T p1, p2;
+  if (list2fpos(&argvars[0], &p1, &fnum1, NULL, false) != OK
+      || list2fpos(&argvars[1], &p2, &fnum2, NULL, false) != OK
+      || fnum1 != fnum2) {
     return;
   }
 
@@ -2866,6 +2862,18 @@ static void f_getregion(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
     return;
   }
 
+  buf_T *save_curbuf = curbuf;
+
+  if (fnum1 != 0) {
+    buf_T *findbuf = buflist_findnr(fnum1);
+    // buffer not loaded
+    if (findbuf == NULL || findbuf->b_ml.ml_mfp == NULL) {
+      return;
+    }
+    save_curbuf = curbuf;
+    curbuf = findbuf;
+  }
+
   const TriState save_virtual = virtual_op;
   virtual_op = virtual_active();
 
@@ -2948,6 +2956,10 @@ static void f_getregion(typval_T *argvars, typval_T *rettv, EvalFuncData fptr)
     tv_list_append_allocated_string(rettv->vval.v_list, akt);
   }
 
+  if (curbuf != save_curbuf) {
+    curbuf = save_curbuf;
+  }
+
   virtual_op = save_virtual;
 }