merge revision(s) d78ae78fd76e556e281a743c75bea4c0bb81ed8c: [Backport #19468]

	rb_str_modify_expand: clear the string coderange

	[Bug #19468]

	b0b9f7201acab05c2a3ad92c3043a1f01df3e17f errornously stopped
	clearing the coderange.

	Since `rb_str_modify` clears it, `rb_str_modify_expand`
	should too.
	---
	 string.c | 1 +
	 1 file changed, 1 insertion(+)

1 files changed, 1 insertions, 0 deletions

diff --git a/string.c b/string.c
index 6773ed2d86..95f023232a 100644
--- a/string.c
+++ b/string.c
@@ -2460,6 +2460,7 @@ rb_str_modify_expand(VALUE str, long expand)
     else if (expand > 0) {
         RESIZE_CAPA_TERM(str, len + expand, termlen);
     }
+    ENC_CODERANGE_CLEAR(str);
 }
 
 /* As rb_str_modify(), but don't clear coderange */