[vte] terminal: Don't append data to sealed chunks

[Christian Persch <chpe src gnome org>]

commit 5ad5aea9f9ad3dc0fc3f04b9301c560b9cf86806
Author: Christian Persch <chpe src gnome org>
Date:   Thu Nov 21 20:01:30 2019 +0100

    terminal: Don't append data to sealed chunks

 src/vte.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/vte.cc b/src/vte.cc
index 138cd553..2894c4ca 100644
--- a/src/vte.cc
+++ b/src/vte.cc
@@ -4081,7 +4081,7 @@ Terminal::feed(std::string_view const& data,
         vte::base::Chunk* chunk = nullptr;
         if (!m_incoming_queue.empty()) {
                 auto& achunk = m_incoming_queue.back();
-                if (length < achunk->remaining_capacity())
+                if (length < achunk->remaining_capacity() && !achunk->sealed())
                         chunk = achunk.get();
         }
         if (chunk == nullptr) {