ex-project didn't report any hint to user such as Refresh file by <leader>R when first time open it.

[jwu]

When you open the ex-project first time, it is empty. I should add some hint such as press <leader>R to refresh it.

Also when you edit file/folder filter in .exvim, should hint the user in status bar: refresh ex-project to apply the new file/folder filter settings.