Fix compilation on 32bit platforms

Fixes #3284

src/buffer_utils.cc

@@ -219,10 +219,12 @@ void write_to_debug_buffer(StringView str)
     }
 }
 
-InplaceString<23> to_string(Buffer::HistoryId id)
+
+auto to_string(Buffer::HistoryId id)
 {
+    using Result = decltype(to_string(size_t{}));
     if (id == Buffer::HistoryId::Invalid)
-        return InplaceString<23>{1, "-"};
+        return Result{1, "-"};
     return to_string(static_cast<size_t>(id));
 }
 

src/buffer_utils.hh

@@ -84,7 +84,6 @@ void reload_file_buffer(Buffer& buffer);
 
 void write_to_debug_buffer(StringView str);
 
-InplaceString<23> to_string(Buffer::HistoryId id);
 String history_as_string(const Vector<Buffer::HistoryNode>& history, Quoting quoting);
 String undo_group_as_string(const Buffer::UndoGroup& undo_group, Quoting quoting);