Editing a frame for multiple files works only for files where frame is present
Kid3 3.1.1, open a directory containing two files where the first has a composer frame with value "Name1" and the second file does not have a Composer frame.
Select both files, Composer has unequal sign as value, enter "Name2" as value. The first file then has Composer "Name2", but the 2nd file has "Name1" (the old Composer value) instead of "Name2".
Select both files, go to Composer row in frame table and click "Edit...", change "Name1" to "Name2", click "OK". The first file has a correctly changed Composer frame, but the second file is unchanged, however, it should now also have a Composer frame with value "Name2".
Imported from SourceForge, author: ufleisch