patch 8.2.2553: Vim9: Cannot put "|" after "{"

Problem:    Vim9: Cannot put "|" after "{".
Solution:   Add the EX_TRLBAR flag. (issue #7904)

Author: brammool

src/ex_cmds.h

@@ -1820,7 +1820,7 @@ EXCMD(CMD_at,		"@",		ex_at,
 	EX_RANGE|EX_WHOLEFOLD|EX_EXTRA|EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK|EX_NONWHITE_OK,
 	ADDR_LINES),
 EXCMD(CMD_block,	"{",		ex_block,  // not found normally
-	0,
+	EX_TRLBAR,
 	ADDR_NONE),
 EXCMD(CMD_endblock,	"}",		ex_endblock,
 	EX_TRLBAR|EX_CMDWIN|EX_LOCK_OK,

src/ex_eval.c

@@ -912,7 +912,7 @@ ex_eval(exarg_T *eap)
 enter_block(cstack_T *cstack)
 {
     ++cstack->cs_idx;
-    if (in_vim9script())
+    if (in_vim9script() && current_sctx.sc_sid > 0)
     {
 	scriptitem_T *si = SCRIPT_ITEM(current_sctx.sc_sid);
 

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2553,
 /**/
     2552,
 /**/