jsapi-util: Fix non-flat string message

Bizarrely, if we construct ostringstream with a string already in it, the
default behaviour is to start overwriting characters at the start when
later inserting more text into the stream. If we don't want that, we have
to construct it with the 'advance to end' flag.

1 files changed, 2 insertions, 1 deletions

diff --git a/gjs/jsapi-util-string.cpp b/gjs/jsapi-util-string.cpp
index 2b880e6f..c78069a8 100644
--- a/gjs/jsapi-util-string.cpp
+++ b/gjs/jsapi-util-string.cpp
@@ -538,7 +538,8 @@ gjs_debug_string(JSString *str)
     if (!str)
         return "<null string>";
     if (!JS_StringIsLinear(str)) {
-        std::ostringstream out("<non-flat string of length ");
+        std::ostringstream out("<non-flat string of length ",
+                               std::ios_base::ate);
         out << JS_GetStringLength(str) << '>';
         return out.str();
     }