I ran into this twice -- if you forget to close Xcode while you're re-codesigning it, everything will seem to work and compile but Xcode won't ask to load the XVim bundle when it loads.
Running defaults delete com.apple.dt.Xcode DVTPlugInManagerNonApplePlugIns-Xcode-10.3 failed (because there were no defaults there to delete).
To fix, I had to close XCode, make uninstall, codesign xcode again and then make install once more. Then I was able to get the "unidentified bundle" dialog when I launched Xcode.
I ran into this twice -- if you forget to close Xcode while you're re-codesigning it, everything will seem to work and compile but Xcode won't ask to load the XVim bundle when it loads.
Running
defaults delete com.apple.dt.Xcode DVTPlugInManagerNonApplePlugIns-Xcode-10.3failed (because there were no defaults there to delete).To fix, I had to close XCode,
make uninstall, codesign xcode again and thenmake installonce more. Then I was able to get the "unidentified bundle" dialog when I launched Xcode.