Problem: It is not possible to use plugins in an "after" directory to tune
the behavior of a package.
Solution: First load plugins from non-after directories, then packages and
finally plugins in after directories.
Reset 'loadplugins' before executing --cmd arguments.
66459b7c98
vim-patch:7.4.2172
vim-patch:7.4.2169
vim-patch:7.4.2177
vim-patch:7.4.2178
vim-patch:7.4.2184
vim-patch:8.0.0050
vim-patch:8.0.0105
vim-patch:8.0.0400
vim-patch:8.0.0405
Closes#6034
