This patch adds activate_file_by_relative_path(relative_path="") and deselect_all() function to the space api of the File Browser. While the first sets the active file and adds it to the selection based on a relative path to the current File Browser directory the second one deselects all files but does not change the active file. Differential Revision: https://developer.blender.org/D12826 Reviewed by: Julian Eisel