move code for readability

Author: gregors

lib/boilerpipe/document/text_block.rb

@@ -67,9 +67,8 @@ def merge_next(other)
         @offset_blocks_start = [@offset_blocks_start, other.offset_blocks_start].min
         @offset_blocks_end = [@offset_blocks_end, other.offset_blocks_end].max
         @content |= other.is_content?
-        init_densities
-
         @labels.merge(other.labels.clone)
+        init_densities
 
         @tag_level = [@tag_level, other.tag_level].min
       end