dgit: quilt linearisation: Stop at debian/source/format changes

Traversing a change of source format will not end well.
Discovered this possibility while investigating #910687.

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

diff --git a/dgit b/dgit
index 2f2b50918afe35c7a6a1ab33e632fcdd660fa37f..8cea07b7af8a16d65016f3c7f68d1625f5768471 100755 (executable)
--- a/dgit
+++ b/dgit
@@ -5503,7 +5503,8 @@ sub quiltify ($$$$) {
            printdebug "considering C=$c->{Commit} P=$p->{Commit}\n";
 
            my @cmd= (@git, qw(diff-tree -r --name-only),
-                     $p->{Commit},$c->{Commit}, qw(-- debian/patches .pc));
+                     $p->{Commit},$c->{Commit},
+                     qw(-- debian/patches .pc debian/source/format));
            my $patchstackchange = cmdoutput @cmd;
            if (length $patchstackchange) {
                $patchstackchange =~ s/\n/,/g;