if we collapse separator1 and try to rename file1.cpp into file2.cpp we will have funny result:
[bug.upp]
file
separator1 readonly separator,
file1.h,
file2.cpp readonly separator,
file1.cpp;
mainconfig
"" = "";
instead of renaming file1.cpp into file2.cpp we will have separator2 renamed.
Rename operation get wrong index of element for ranaming in case of collapsed separators.