patch 8.2.2775: Vim9: wrong line number used for some commands

Problem:    Vim9: wrong line number used for some commands.
Solution:   For :exe, :echo and the like use the line number of the start of
            the command.  When calling a function set the line number in the
            script context.

src/structs.h

@@ -2045,7 +2045,7 @@ typedef struct {
 	except_T   *except; // exception info
     } es_info;
 #if defined(FEAT_EVAL)
-    scid_T	es_save_sid;	    // saved sc_sid when calling function
+    sctx_T	es_save_sctx;	    // saved current_sctx when calling function
 #endif
 } estack_T;
 

src/testdir/test_vim9_script.vim

@@ -3848,6 +3848,37 @@ def Test_unsupported_commands()
   CheckScriptFailure(['vim9script'] + lines, 'E1100:')
 enddef
 
+def Test_mapping_line_number()
+  var lines =<< trim END
+      vim9script
+      def g:FuncA()
+          # Some comment
+          FuncB(0)
+      enddef
+          # Some comment
+      def FuncB(
+          # Some comment
+          n: number
+      )
+          exe 'nno '
+              # Some comment
+              .. '<F3> a'
+              .. 'b'
+              .. 'c'
+      enddef
+  END
+  CheckScriptSuccess(lines)
+  var res = execute('verbose nmap <F3>')
+  assert_match('No mapping found', res)
+
+  g:FuncA()
+  res = execute('verbose nmap <F3>')
+  assert_match(' <F3> .* abc.*Last set from .*XScriptSuccess\d\+ line 11', res)
+
+  nunmap <F3>
+  delfunc g:FuncA
+enddef
+
 " Keep this last, it messes up highlighting.
 def Test_substitute_cmd()
   new

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2775,
 /**/
     2774,
 /**/

src/vim9compile.c

@@ -8221,6 +8221,7 @@ compile_mult_expr(char_u *arg, int cmdidx, cctx_T *cctx)
     char_u	*p = arg;
     char_u	*prev = arg;
     int		count = 0;
+    int		start_ctx_lnum = cctx->ctx_lnum;
 
     for (;;)
     {
@@ -8235,6 +8236,11 @@ compile_mult_expr(char_u *arg, int cmdidx, cctx_T *cctx)
 
     if (count > 0)
     {
+	long save_lnum = cctx->ctx_lnum;
+
+	// Use the line number where the command started.
+	cctx->ctx_lnum = start_ctx_lnum;
+
 	if (cmdidx == CMD_echo || cmdidx == CMD_echon)
 	    generate_ECHO(cctx, cmdidx == CMD_echo, count);
 	else if (cmdidx == CMD_execute)
@@ -8243,6 +8249,8 @@ compile_mult_expr(char_u *arg, int cmdidx, cctx_T *cctx)
 	    generate_MULT_EXPR(cctx, ISN_ECHOMSG, count);
 	else
 	    generate_MULT_EXPR(cctx, ISN_ECHOERR, count);
+
+	cctx->ctx_lnum = save_lnum;
     }
     return p;
 }

src/vim9execute.c

@@ -329,9 +329,9 @@ call_dfunc(
     if (entry != NULL)
     {
 	// Set the script context to the script where the function was defined.
-	// TODO: save more than the SID?
-	entry->es_save_sid = current_sctx.sc_sid;
-	current_sctx.sc_sid = ufunc->uf_script_ctx.sc_sid;
+	// Save the current context so it can be restored on return.
+	entry->es_save_sctx = current_sctx;
+	current_sctx = ufunc->uf_script_ctx;
     }
 
     // Start execution at the first instruction.
@@ -562,7 +562,7 @@ func_return(funclocal_T *funclocal, ectx_T *ectx)
     // execution context goes one level up
     entry = estack_pop();
     if (entry != NULL)
-	current_sctx.sc_sid = entry->es_save_sid;
+	current_sctx = entry->es_save_sctx;
 
     if (handle_closure_in_use(ectx, TRUE) == FAIL)
 	return FAIL;