dgit: -wg / -wgf clean check is a no-op

Document this, and handle it explicitly in the clean_tree_check
conditional and in the test suite.

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

1 files changed, 6 insertions, 1 deletions

diff --git a/dgit.1 b/dgit.1
index 5155dc0..c3dd420 100644
--- a/dgit.1
+++ b/dgit.1
@@ -538,7 +538,12 @@ This will delete all files which are not tracked by git.
 options other than dpkg-source
 are useful when the package's clean target is troublesome, or
 to avoid needing the build-dependencies.
-.TP
+
+dgit will only actually clean the tree if it needs to
+(because it needs to build the source package
+or binaries from your working tree).
+Otherwise any untracked files will be simply ignored.
+p.TP
 .BR --clean=git-ff " | " -wgf
 Use
 .BR "git clean -xdff"