GTX780 ti (368.69)
Broken: 2.78 b76dbf5
Short description of error
The length of a row.prop_search() in python seems to be fixed and act strangely in UI if we add an icon at the end with the next row.
This is not happening if we use a col.prop_search() : see image .gif
Exact steps for others to reproduce the error
Open the .blend file, run the script and look for "Hello World Panel" in the properties of the object.
Expand and reduce the panel to see the problem (like in gif image).
Sorry if it's not a bug and thanks for your work.