Redmine

I tried to apply change_to_right_and_left_resizable_panel_v2.patch in #20481 to my Redmine 3.3.3, but seems the files content have been changed, and it can't be patch directly even though I modified the file path in patch file to be corresponding with the path of my redmine installed.
then, I tried modified my redmine files' code according to the modification content in this patch file, and restart redmine(subversion,mysql, apache), but left side of gannt is not resizable yet. seems this modification is not suitable for Redmine 3.3.3.