This is a bug report for GitHub.
The GitHub Subversion bridge doesn’t work properly with files whose names contain the + character.
Using subversion 1.13.0 on macOS 10.13.6, I used “svn mv” to rename an existing file. The new filename contained a + character. After being committed to git, the + character in the filename changed to either the space character or the three characters %20; looking at it in different places showed different results:
I corrected the filename using the GitHub web interface:
but hopefully you can fix this bug in the Subversion bridge. Thanks.