Fixed potential crash if file-read accidently splits up an UTF-8 char.

src/sourcefile.cc

@@ -20,8 +20,12 @@ bool juci::filesystem::read(const std::string &path, Glib::RefPtr<Gtk::TextBuffe
   if(input) {
     std::vector<char> buffer(buffer_size);
     size_t read_length;
+    std::string buffer_str;
     while((read_length=input.read(&buffer[0], buffer_size).gcount())>0) {
-      auto ustr=Glib::ustring(std::string(&buffer[0], read_length));
+      buffer_str+=std::string(&buffer[0], read_length);
+      if(buffer_str.back()>=0) {
+        auto ustr=Glib::ustring(buffer_str);
+        buffer_str="";
         if(ustr.validate())
           text_buffer->insert_at_cursor(ustr);
         else {
@@ -29,6 +33,7 @@ bool juci::filesystem::read(const std::string &path, Glib::RefPtr<Gtk::TextBuffe
           return false;
         }
       }
+    }
     input.close();
     return true;
   }