don't fall back to json dict for text that only contains latin-1

background-script.js

@@ -139,6 +139,15 @@ function json_lookup_arbitrary_as_is(dict, text)
     return copy(dict.entries[index]);
 }
 function json_dict_any_as_is(text)
+{
+    let maybe_found_non_latin = false;
+    for(let i = 0; i < text.length; i++)
+    {
+        let codepoint = text.codePointAt(i);
+        if(codepoint > 0x100)
+            maybe_found_non_latin = true;
+    }
+    if(maybe_found_non_latin)
     {
         for(let dict of json_dicts)
         {
@@ -146,6 +155,7 @@ function json_dict_any_as_is(text)
             if(ret !== undefined)
                 return ret;
         }
+    }
     return undefined;
 }