fix default behaviour

cmd/reviewdog/main.go

@@ -359,14 +359,18 @@ github-pr-check reporter as a fallback.
 		cs = bbservice.NewReportAnnotator(client, reportName,
 			build.Owner, build.Repo, build.SHA)
 
-		// by default scan whole project.
+		// by default scan whole project with "filter.ModeNoFilter"
 		// Bitbucket pipelines doesn't give an easy way to know
 		// which commit run pipeline before so we can comapre between them
 		// however once PR is opened, Bitbucket Reports UI will do automatic
 		// filtering of annotations dividing them in two groups:
 		// - This pull request (10)
 		// - All (50)
-		if opt.diffCmd == "" || opt.filterMode == filter.ModeNoFilter {
+		if opt.diffCmd == "" && opt.filterMode == filter.ModeDefault {
+			opt.filterMode = filter.ModeNoFilter
+		}
+
+		if opt.filterMode == filter.ModeNoFilter {
 			ds = &reviewdog.EmptyDiff{}
 		} else {
 			d, err := diffService(opt.diffCmd, opt.diffStrip)