patch 8.2.2706: Vim9: wrong line number reported for boolean operator

Problem:    Vim9: wrong line number reported for boolean operator.
Solution:   Use the line number before skipping over line break.
            (closes #8058)
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 7a9b1e4..4758fec 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -467,16 +467,30 @@
   CheckScriptFailure(lines, 'E1004:', 2)
 enddef
 
-func Test_expr3_fails()
-  let msg = "White space required before and after '&&'"
-  call CheckDefFailure(["var x = 1&&2"], msg, 1)
-  call CheckDefFailure(["var x = 1 &&2"], msg, 1)
-  call CheckDefFailure(["var x = 1&& 2"], msg, 1)
+def Test_expr3_fails()
+  var msg = "White space required before and after '&&'"
+  CheckDefFailure(["var x = 1&&2"], msg, 1)
+  CheckDefFailure(["var x = 1 &&2"], msg, 1)
+  CheckDefFailure(["var x = 1&& 2"], msg, 1)
 
-  call CheckDefFailure(["if 'yes' && 0", 'echo 0', 'endif'], 'E1012: Type mismatch; expected bool but got string', 1)
+  CheckDefFailure(["if 'yes' && 0", 'echo 0', 'endif'], 'E1012: Type mismatch; expected bool but got string', 1)
 
-  call CheckDefExecFailure(['assert_equal(false, Record(1) && Record(4) && Record(0))'], 'E1023: Using a Number as a Bool: 4', 1)
-endfunc
+  CheckDefExecFailure(['assert_equal(false, Record(1) && Record(4) && Record(0))'], 'E1023: Using a Number as a Bool: 4', 1)
+
+  var lines =<< trim END
+      if 3
+          && true
+      endif
+  END
+  CheckDefExecFailure(lines, 'E1023:', 1)
+
+  lines =<< trim END
+      if 'yes'
+          && true
+      endif
+  END
+  CheckDefFailure(lines, 'E1012:', 1)
+enddef
 
 " global variables to use for tests with the "any" type
 let atrue = v:true
diff --git a/src/version.c b/src/version.c
index db8219e..92e3b4c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2706,
+/**/
     2705,
 /**/
     2704,
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 4d702d4..d8c955e 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -4772,6 +4772,10 @@
 	ga_init2(&end_ga, sizeof(int), 10);
 	while (p[0] == opchar && p[1] == opchar)
 	{
+	    long	start_lnum = SOURCING_LNUM;
+	    int		start_ctx_lnum = cctx->ctx_lnum;
+	    int		save_lnum;
+
 	    if (next != NULL)
 	    {
 		*arg = next_line_from_context(cctx, TRUE);
@@ -4790,11 +4794,16 @@
 	    generate_ppconst(cctx, ppconst);
 
 	    // Every part must evaluate to a bool.
+	    SOURCING_LNUM = start_lnum;
+	    save_lnum = cctx->ctx_lnum;
+	    cctx->ctx_lnum = start_ctx_lnum;
 	    if (bool_on_stack(cctx) == FAIL)
 	    {
+		cctx->ctx_lnum = save_lnum;
 		ga_clear(&end_ga);
 		return FAIL;
 	    }
+	    cctx->ctx_lnum = save_lnum;
 
 	    if (ga_grow(&end_ga, 1) == FAIL)
 	    {