maintner: don't generate no-op github issue mutations on empty bodies

Fixes golang/go#35985

Change-Id: I45a10ce99bf047c600d72db2dc1428235103322f
Reviewed-on: https://go-review.googlesource.com/c/build/+/209967
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Alexander Rakoczy <alex@golang.org>
diff --git a/maintner/github.go b/maintner/github.go
index 8283a20..2f06487 100644
--- a/maintner/github.go
+++ b/maintner/github.go
@@ -1077,7 +1077,7 @@
 	if d.a != nil && d.a.Body == d.b.GetBody() {
 		return false
 	}
-	m.Body = d.b.GetBody()
+	m.BodyChange = &maintpb.StringChange{Val: d.b.GetBody()}
 	return true
 }
 
@@ -1086,7 +1086,11 @@
 		return false
 	}
 	m.Title = d.b.GetTitle()
-	return true
+	// TODO: emit a StringChange if we ever have a problem that we
+	// legitimately need real issues with no titles reflected in
+	// maintner's model. For now just ignore such changes, if
+	// GitHub even permits the.
+	return m.Title != ""
 }
 
 func (d githubIssueDiffer) diffMilestone(m *maintpb.GithubIssueMutation) bool {
@@ -1342,6 +1346,9 @@
 	if m.Body != "" {
 		gi.Body = m.Body
 	}
+	if m.BodyChange != nil {
+		gi.Body = m.BodyChange.Val
+	}
 	if m.Title != "" {
 		gi.Title = m.Title
 	}
diff --git a/maintner/maintner_test.go b/maintner/maintner_test.go
index 94c485c..aa5a846 100644
--- a/maintner/maintner_test.go
+++ b/maintner/maintner_test.go
@@ -74,7 +74,7 @@
 	tp2, _ = ptypes.TimestampProto(t2)
 }
 
-func TestProcessMutation_Github_NewIssue(t *testing.T) {
+func singleIssueGitHubCorpus() *Corpus {
 	c := new(Corpus)
 	github := &GitHub{c: c}
 	c.github = github
@@ -97,7 +97,11 @@
 			},
 		},
 	}
-	mutationTest{want: c}.test(t, &maintpb.Mutation{
+	return c
+}
+
+func TestProcessMutation_Github_NewIssue(t *testing.T) {
+	mutationTest{want: singleIssueGitHubCorpus()}.test(t, &maintpb.Mutation{
 		GithubIssue: &maintpb.GithubIssueMutation{
 			Owner:  "golang",
 			Repo:   "go",
@@ -113,6 +117,31 @@
 	})
 }
 
+func TestProcessMutation_Github_RemoveBody(t *testing.T) {
+	c := singleIssueGitHubCorpus()
+	want := singleIssueGitHubCorpus()
+	want.github.repos[GitHubRepoID{"golang", "go"}].issues[3].Body = ""
+	mutationTest{corpus: c, want: want}.test(t, &maintpb.Mutation{
+		GithubIssue: &maintpb.GithubIssueMutation{
+			Owner:      "golang",
+			Repo:       "go",
+			Number:     3,
+			BodyChange: &maintpb.StringChange{Val: ""},
+		},
+	})
+
+	// And test that the old mutation field (Body) still works.
+	want.github.repos[GitHubRepoID{"golang", "go"}].issues[3].Body = "and back"
+	mutationTest{corpus: c, want: want}.test(t, &maintpb.Mutation{
+		GithubIssue: &maintpb.GithubIssueMutation{
+			Owner:  "golang",
+			Repo:   "go",
+			Number: 3,
+			Body:   "and back",
+		},
+	})
+}
+
 func TestProcessMutation_Github(t *testing.T) {
 	c := new(Corpus)
 	github := &GitHub{c: c}
@@ -148,7 +177,7 @@
 		Owner:       "golang",
 		Repo:        "go",
 		Number:      5,
-		Body:        "body of the issue",
+		BodyChange:  &maintpb.StringChange{Val: "body of the issue"},
 		Created:     tp1,
 		Updated:     tp2,
 		Assignees:   []*maintpb.GithubUser{},
diff --git a/maintner/maintnerd/maintnerd.go b/maintner/maintnerd/maintnerd.go
index b5ca11f..d062578 100644
--- a/maintner/maintnerd/maintnerd.go
+++ b/maintner/maintnerd/maintnerd.go
@@ -355,6 +355,8 @@
 	}
 	*pubsub = "https://pubsubhelper.golang.org"
 	*watchGithub = strings.Join(goGitHubProjects, ",")
+	*watchGithub = "golang/sys"
+	return
 
 	gerrc := gerrit.NewClient("https://go-review.googlesource.com", gerrit.NoAuth)
 	projs, err := gerrc.ListProjects(context.Background())
diff --git a/maintner/maintpb/maintner.pb.go b/maintner/maintpb/maintner.pb.go
index 822273d..e209fad 100644
--- a/maintner/maintpb/maintner.pb.go
+++ b/maintner/maintpb/maintner.pb.go
@@ -12,6 +12,7 @@
 	GithubMutation
 	GithubIssueMutation
 	BoolChange
+	StringChange
 	GithubLabel
 	GithubMilestone
 	GithubIssueEvent
@@ -145,9 +146,14 @@
 	DeletedAssignees []int64                    `protobuf:"varint,11,rep,packed,name=deleted_assignees,json=deletedAssignees" json:"deleted_assignees,omitempty"`
 	Created          *google_protobuf.Timestamp `protobuf:"bytes,5,opt,name=created" json:"created,omitempty"`
 	Updated          *google_protobuf.Timestamp `protobuf:"bytes,6,opt,name=updated" json:"updated,omitempty"`
-	Body             string                     `protobuf:"bytes,7,opt,name=body" json:"body,omitempty"`
 	Title            string                     `protobuf:"bytes,9,opt,name=title" json:"title,omitempty"`
-	NoMilestone      bool                       `protobuf:"varint,15,opt,name=no_milestone,json=noMilestone" json:"no_milestone,omitempty"`
+	// body_change changes the body field (the top post, which isn't a comment).
+	// It is now used in preference to the old body field.
+	BodyChange *StringChange `protobuf:"bytes,31,opt,name=body_change,json=bodyChange" json:"body_change,omitempty"`
+	// body was the old way to change the body, but it doesn't support removing the
+	// body text, which is common on PRs. New mutations use body_change instead.
+	Body        string `protobuf:"bytes,7,opt,name=body" json:"body,omitempty"`
+	NoMilestone bool   `protobuf:"varint,15,opt,name=no_milestone,json=noMilestone" json:"no_milestone,omitempty"`
 	// When setting a milestone, only the milestone_id must be set.
 	// TODO: allow num or title to be used if Github only returns those? So far unneeded.
 	// The num and title, if non-zero, are treated as if they were a GithubMutation.Milestone update.
@@ -244,16 +250,23 @@
 	return nil
 }
 
-func (m *GithubIssueMutation) GetBody() string {
+func (m *GithubIssueMutation) GetTitle() string {
 	if m != nil {
-		return m.Body
+		return m.Title
 	}
 	return ""
 }
 
-func (m *GithubIssueMutation) GetTitle() string {
+func (m *GithubIssueMutation) GetBodyChange() *StringChange {
 	if m != nil {
-		return m.Title
+		return m.BodyChange
+	}
+	return nil
+}
+
+func (m *GithubIssueMutation) GetBody() string {
+	if m != nil {
+		return m.Body
 	}
 	return ""
 }
@@ -378,6 +391,7 @@
 }
 
 // BoolChange represents a change to a boolean value.
+// (Notably, the wrapper type permits representing a change to false.)
 type BoolChange struct {
 	Val bool `protobuf:"varint,1,opt,name=val" json:"val,omitempty"`
 }
@@ -394,6 +408,24 @@
 	return false
 }
 
+// StringChange represents a change to a boolean value.
+// (Notably, the wrapper type permits representing a change to the empty string.)
+type StringChange struct {
+	Val string `protobuf:"bytes,1,opt,name=val" json:"val,omitempty"`
+}
+
+func (m *StringChange) Reset()                    { *m = StringChange{} }
+func (m *StringChange) String() string            { return proto.CompactTextString(m) }
+func (*StringChange) ProtoMessage()               {}
+func (*StringChange) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
+
+func (m *StringChange) GetVal() string {
+	if m != nil {
+		return m.Val
+	}
+	return ""
+}
+
 type GithubLabel struct {
 	Id   int64  `protobuf:"varint,1,opt,name=id" json:"id,omitempty"`
 	Name string `protobuf:"bytes,2,opt,name=name" json:"name,omitempty"`
@@ -402,7 +434,7 @@
 func (m *GithubLabel) Reset()                    { *m = GithubLabel{} }
 func (m *GithubLabel) String() string            { return proto.CompactTextString(m) }
 func (*GithubLabel) ProtoMessage()               {}
-func (*GithubLabel) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
+func (*GithubLabel) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
 
 func (m *GithubLabel) GetId() int64 {
 	if m != nil {
@@ -429,7 +461,7 @@
 func (m *GithubMilestone) Reset()                    { *m = GithubMilestone{} }
 func (m *GithubMilestone) String() string            { return proto.CompactTextString(m) }
 func (*GithubMilestone) ProtoMessage()               {}
-func (*GithubMilestone) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{5} }
+func (*GithubMilestone) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
 
 func (m *GithubMilestone) GetId() int64 {
 	if m != nil {
@@ -502,7 +534,7 @@
 func (m *GithubIssueEvent) Reset()                    { *m = GithubIssueEvent{} }
 func (m *GithubIssueEvent) String() string            { return proto.CompactTextString(m) }
 func (*GithubIssueEvent) ProtoMessage()               {}
-func (*GithubIssueEvent) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{6} }
+func (*GithubIssueEvent) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
 
 func (m *GithubIssueEvent) GetId() int64 {
 	if m != nil {
@@ -628,7 +660,7 @@
 func (m *GithubDismissedReviewEvent) Reset()                    { *m = GithubDismissedReviewEvent{} }
 func (m *GithubDismissedReviewEvent) String() string            { return proto.CompactTextString(m) }
 func (*GithubDismissedReviewEvent) ProtoMessage()               {}
-func (*GithubDismissedReviewEvent) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{7} }
+func (*GithubDismissedReviewEvent) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
 
 func (m *GithubDismissedReviewEvent) GetReviewId() int64 {
 	if m != nil {
@@ -660,7 +692,7 @@
 func (m *GithubCommit) Reset()                    { *m = GithubCommit{} }
 func (m *GithubCommit) String() string            { return proto.CompactTextString(m) }
 func (*GithubCommit) ProtoMessage()               {}
-func (*GithubCommit) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{8} }
+func (*GithubCommit) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{9} }
 
 func (m *GithubCommit) GetOwner() string {
 	if m != nil {
@@ -703,7 +735,7 @@
 func (m *GithubReview) Reset()                    { *m = GithubReview{} }
 func (m *GithubReview) String() string            { return proto.CompactTextString(m) }
 func (*GithubReview) ProtoMessage()               {}
-func (*GithubReview) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{9} }
+func (*GithubReview) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{10} }
 
 func (m *GithubReview) GetId() int64 {
 	if m != nil {
@@ -774,7 +806,7 @@
 func (m *GithubIssueSyncStatus) Reset()                    { *m = GithubIssueSyncStatus{} }
 func (m *GithubIssueSyncStatus) String() string            { return proto.CompactTextString(m) }
 func (*GithubIssueSyncStatus) ProtoMessage()               {}
-func (*GithubIssueSyncStatus) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{10} }
+func (*GithubIssueSyncStatus) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{11} }
 
 func (m *GithubIssueSyncStatus) GetServerDate() *google_protobuf.Timestamp {
 	if m != nil {
@@ -794,7 +826,7 @@
 func (m *GithubIssueCommentMutation) Reset()                    { *m = GithubIssueCommentMutation{} }
 func (m *GithubIssueCommentMutation) String() string            { return proto.CompactTextString(m) }
 func (*GithubIssueCommentMutation) ProtoMessage()               {}
-func (*GithubIssueCommentMutation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{11} }
+func (*GithubIssueCommentMutation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{12} }
 
 func (m *GithubIssueCommentMutation) GetId() int64 {
 	if m != nil {
@@ -839,7 +871,7 @@
 func (m *GithubUser) Reset()                    { *m = GithubUser{} }
 func (m *GithubUser) String() string            { return proto.CompactTextString(m) }
 func (*GithubUser) ProtoMessage()               {}
-func (*GithubUser) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{12} }
+func (*GithubUser) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
 
 func (m *GithubUser) GetId() int64 {
 	if m != nil {
@@ -863,7 +895,7 @@
 func (m *GithubTeam) Reset()                    { *m = GithubTeam{} }
 func (m *GithubTeam) String() string            { return proto.CompactTextString(m) }
 func (*GithubTeam) ProtoMessage()               {}
-func (*GithubTeam) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{13} }
+func (*GithubTeam) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
 
 func (m *GithubTeam) GetId() int64 {
 	if m != nil {
@@ -889,7 +921,7 @@
 func (m *GitMutation) Reset()                    { *m = GitMutation{} }
 func (m *GitMutation) String() string            { return proto.CompactTextString(m) }
 func (*GitMutation) ProtoMessage()               {}
-func (*GitMutation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{14} }
+func (*GitMutation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
 
 func (m *GitMutation) GetRepo() *GitRepo {
 	if m != nil {
@@ -914,7 +946,7 @@
 func (m *GitRepo) Reset()                    { *m = GitRepo{} }
 func (m *GitRepo) String() string            { return proto.CompactTextString(m) }
 func (*GitRepo) ProtoMessage()               {}
-func (*GitRepo) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{15} }
+func (*GitRepo) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
 
 func (m *GitRepo) GetGoRepo() string {
 	if m != nil {
@@ -933,7 +965,7 @@
 func (m *GitCommit) Reset()                    { *m = GitCommit{} }
 func (m *GitCommit) String() string            { return proto.CompactTextString(m) }
 func (*GitCommit) ProtoMessage()               {}
-func (*GitCommit) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{16} }
+func (*GitCommit) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
 
 func (m *GitCommit) GetSha1() string {
 	if m != nil {
@@ -964,7 +996,7 @@
 func (m *GitDiffTree) Reset()                    { *m = GitDiffTree{} }
 func (m *GitDiffTree) String() string            { return proto.CompactTextString(m) }
 func (*GitDiffTree) ProtoMessage()               {}
-func (*GitDiffTree) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
+func (*GitDiffTree) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
 
 func (m *GitDiffTree) GetFile() []*GitDiffTreeFile {
 	if m != nil {
@@ -984,7 +1016,7 @@
 func (m *GitDiffTreeFile) Reset()                    { *m = GitDiffTreeFile{} }
 func (m *GitDiffTreeFile) String() string            { return proto.CompactTextString(m) }
 func (*GitDiffTreeFile) ProtoMessage()               {}
-func (*GitDiffTreeFile) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
+func (*GitDiffTreeFile) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
 
 func (m *GitDiffTreeFile) GetFile() string {
 	if m != nil {
@@ -1029,7 +1061,7 @@
 func (m *GerritMutation) Reset()                    { *m = GerritMutation{} }
 func (m *GerritMutation) String() string            { return proto.CompactTextString(m) }
 func (*GerritMutation) ProtoMessage()               {}
-func (*GerritMutation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{19} }
+func (*GerritMutation) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
 
 func (m *GerritMutation) GetProject() string {
 	if m != nil {
@@ -1074,7 +1106,7 @@
 func (m *GitRef) Reset()                    { *m = GitRef{} }
 func (m *GitRef) String() string            { return proto.CompactTextString(m) }
 func (*GitRef) ProtoMessage()               {}
-func (*GitRef) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{20} }
+func (*GitRef) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{21} }
 
 func (m *GitRef) GetRef() string {
 	if m != nil {
@@ -1095,6 +1127,7 @@
 	proto.RegisterType((*GithubMutation)(nil), "maintpb.GithubMutation")
 	proto.RegisterType((*GithubIssueMutation)(nil), "maintpb.GithubIssueMutation")
 	proto.RegisterType((*BoolChange)(nil), "maintpb.BoolChange")
+	proto.RegisterType((*StringChange)(nil), "maintpb.StringChange")
 	proto.RegisterType((*GithubLabel)(nil), "maintpb.GithubLabel")
 	proto.RegisterType((*GithubMilestone)(nil), "maintpb.GithubMilestone")
 	proto.RegisterType((*GithubIssueEvent)(nil), "maintpb.GithubIssueEvent")
@@ -1117,100 +1150,102 @@
 func init() { proto.RegisterFile("maintner.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 1505 bytes of a gzipped FileDescriptorProto
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+	0xc6, 0x67, 0x8f, 0xc2, 0x12, 0x4a, 0x6e, 0x43, 0xd7, 0x8e, 0x07, 0x65, 0x77, 0x07, 0xed, 0x06,
+	0xcb, 0x1a, 0x86, 0x15, 0x00, 0x3a, 0xe6, 0x2c, 0x00, 0x94, 0x6f, 0x0f, 0xa1, 0xad, 0xca, 0x24,
+	0x92, 0xd8, 0xd0, 0x4f, 0x67, 0xe8, 0x01, 0x0a, 0x99, 0x01, 0xa9, 0xfd, 0x32, 0xae, 0x22, 0xee,
+	0x4f, 0x32, 0x91, 0xd0, 0x2e, 0xde, 0x22, 0x68, 0xd6, 0xeb, 0x4c, 0x24, 0x6a, 0x82, 0x1a, 0x80,
+	0x14, 0x38, 0x2b, 0x5d, 0xe6, 0x68, 0xc6, 0xa1, 0xd0, 0xda, 0x2a, 0x55, 0xb5, 0x35, 0x6b, 0xda,
+	0x1a, 0xcb, 0x1a, 0x86, 0x64, 0x00, 0x9b, 0xa6, 0x00, 0x4c, 0x3f, 0xd4, 0xc0, 0x75, 0x04, 0x5e,
+	0xd2, 0x22, 0x66, 0x25, 0xc3, 0x90, 0x3c, 0x83, 0x35, 0xc9, 0x83, 0xc4, 0xb7, 0x5b, 0xe0, 0x24,
+	0x38, 0xdd, 0xe5, 0x0e, 0x79, 0x90, 0xb0, 0x9e, 0x42, 0x32, 0x03, 0x24, 0xef, 0xa0, 0x1f, 0x46,
+	0x79, 0x12, 0xe5, 0xaa, 0x3d, 0x9a, 0x1a, 0xdd, 0x40, 0xe5, 0xe5, 0xe6, 0xf4, 0xd2, 0xc2, 0xb4,
+	0xae, 0x6e, 0x11, 0x1b, 0xe1, 0x22, 0x57, 0x65, 0x97, 0x90, 0x47, 0x3c, 0xf3, 0x3f, 0xe6, 0x22,
+	0xa5, 0xb0, 0x53, 0xdb, 0xed, 0x31, 0x17, 0x39, 0x6f, 0x72, 0x91, 0x7a, 0x9f, 0x6b, 0xb0, 0x7d,
+	0xf6, 0x76, 0xfa, 0xd6, 0xd0, 0xef, 0x22, 0x65, 0x1d, 0xcd, 0x18, 0x86, 0xf8, 0x16, 0xd0, 0x4a,
+	0x41, 0xec, 0x27, 0x3c, 0xcf, 0x83, 0x29, 0xc7, 0x14, 0x75, 0x59, 0xbf, 0x10, 0xbc, 0xd5, 0x7c,
+	0x55, 0x65, 0xaa, 0x77, 0x70, 0xcc, 0x54, 0x97, 0x69, 0xe2, 0x4d, 0xd3, 0xa9, 0xf7, 0x1b, 0xde,
+	0x07, 0xe8, 0x55, 0x83, 0xfa, 0x15, 0xef, 0xa5, 0xeb, 0xe0, 0xea, 0x04, 0xb0, 0xd5, 0xe1, 0x32,
+	0x47, 0x33, 0x86, 0xa1, 0xf7, 0xb9, 0x6e, 0xf7, 0x35, 0x77, 0xb1, 0x5c, 0x79, 0xd5, 0xd2, 0xaa,
+	0x9f, 0x59, 0x5a, 0x8d, 0x8b, 0x97, 0x96, 0x7d, 0x36, 0x34, 0x2b, 0xcf, 0x86, 0xc2, 0xf1, 0x56,
+	0xc5, 0xf1, 0x45, 0xc3, 0xdb, 0x8b, 0x86, 0xab, 0x8b, 0xd5, 0x76, 0x05, 0x79, 0x2e, 0xc6, 0x11,
+	0x8e, 0x1d, 0xf3, 0x14, 0xe9, 0xa3, 0x60, 0xbf, 0xe4, 0x2f, 0x05, 0xd8, 0x59, 0x0e, 0xf0, 0x21,
+	0x6c, 0xad, 0x6c, 0xce, 0xe4, 0x39, 0x74, 0x73, 0x9e, 0x1d, 0xf3, 0xcc, 0x57, 0x0f, 0x28, 0xf3,
+	0x37, 0xf8, 0x92, 0x97, 0xa0, 0xe1, 0x2f, 0x03, 0xc9, 0xd5, 0x37, 0x63, 0xfb, 0xec, 0x11, 0x79,
+	0xea, 0xa2, 0xed, 0x8b, 0xb4, 0x7e, 0xde, 0x8b, 0xd4, 0x5e, 0x60, 0xa3, 0x72, 0x81, 0xff, 0xad,
+	0xcb, 0x55, 0x5e, 0x91, 0xad, 0x0b, 0xbf, 0x22, 0xbd, 0x27, 0x00, 0xa5, 0x4d, 0xab, 0x26, 0x45,
+	0x2c, 0xa6, 0x51, 0x6a, 0x27, 0x05, 0x12, 0xde, 0x23, 0xab, 0xa3, 0xaa, 0x79, 0xd5, 0x50, 0xca,
+	0xe3, 0xf9, 0xd4, 0x66, 0xad, 0x5a, 0x7b, 0x3e, 0xce, 0xb1, 0xe2, 0xb6, 0xfe, 0x6f, 0x12, 0x5b,
+	0x87, 0xa0, 0x5f, 0xbd, 0x1d, 0xc6, 0x67, 0xc2, 0xa4, 0xfa, 0xbd, 0xa2, 0x21, 0xea, 0x5b, 0x24,
+	0x55, 0xdc, 0x62, 0x37, 0xf4, 0x3c, 0xe8, 0x18, 0x65, 0x72, 0x15, 0x3a, 0x53, 0xe1, 0x17, 0xfb,
+	0xbb, 0xac, 0x3d, 0x15, 0x4a, 0xe0, 0x85, 0xe0, 0x16, 0x8a, 0x68, 0xe5, 0x51, 0xf0, 0xd8, 0x40,
+	0x70, 0xad, 0xe6, 0x6f, 0x16, 0x7c, 0xc2, 0xd3, 0x7a, 0x4c, 0x2d, 0xd5, 0x13, 0x2b, 0x8c, 0x26,
+	0x13, 0x5f, 0x66, 0x9c, 0x9b, 0xb2, 0x58, 0x98, 0x1e, 0x2f, 0xa3, 0xc9, 0xe4, 0x30, 0xe3, 0x9c,
+	0x39, 0xa1, 0x59, 0x79, 0xcf, 0xd1, 0x55, 0x2b, 0x20, 0x0f, 0xa0, 0x39, 0x89, 0x62, 0x95, 0x6d,
+	0xa7, 0x7e, 0x55, 0x16, 0xf3, 0x3a, 0x8a, 0x39, 0x43, 0x94, 0x97, 0xe0, 0xf0, 0xae, 0x0a, 0x94,
+	0xa1, 0x66, 0x03, 0x34, 0x54, 0xad, 0x55, 0x58, 0x82, 0x30, 0xe4, 0xb6, 0x86, 0x35, 0x41, 0x28,
+	0x74, 0xcc, 0x87, 0xc4, 0x8e, 0x4d, 0x43, 0xaa, 0x69, 0x3d, 0x8a, 0xd2, 0x20, 0xd3, 0x75, 0xea,
+	0x30, 0x43, 0x79, 0x7f, 0xa9, 0x3f, 0xe6, 0xc2, 0xf7, 0x53, 0x6d, 0x32, 0xcb, 0xc4, 0x47, 0x3e,
+	0x96, 0xe6, 0x44, 0x4b, 0x92, 0x07, 0xfa, 0xed, 0x18, 0xc9, 0x9c, 0xd6, 0xd1, 0x99, 0x55, 0xf1,
+	0xb0, 0x10, 0x72, 0x47, 0x85, 0x78, 0x62, 0xff, 0x9f, 0x1b, 0x8b, 0x21, 0x9e, 0x30, 0x14, 0xaa,
+	0x47, 0xae, 0xfd, 0x5b, 0x21, 0x58, 0x7d, 0x3d, 0x5d, 0xd6, 0x35, 0x3c, 0xc6, 0x27, 0xb9, 0x37,
+	0x80, 0xb6, 0x56, 0xc1, 0xe8, 0xf0, 0x89, 0x7d, 0x1d, 0x65, 0x7c, 0x52, 0xc4, 0xb0, 0x5e, 0xc6,
+	0x70, 0xd4, 0xc6, 0x64, 0xff, 0xf6, 0xdf, 0x00, 0x00, 0x00, 0xff, 0xff, 0xdd, 0x4d, 0xc5, 0xae,
+	0x6d, 0x10, 0x00, 0x00,
 }
diff --git a/maintner/maintpb/maintner.proto b/maintner/maintpb/maintner.proto
index 61f73e2..b463381 100644
--- a/maintner/maintpb/maintner.proto
+++ b/maintner/maintpb/maintner.proto
@@ -46,9 +46,15 @@
   repeated int64 deleted_assignees = 11; // IDs of users to delete from the assignee list
   google.protobuf.Timestamp created = 5; // only needed on new issues
   google.protobuf.Timestamp updated = 6; // only set on updated issue text
-  string body = 7; // for new or updated issue text (top post, which isn't a comment)
   string title = 9; // issue title
 
+  // body_change changes the body field (the top post, which isn't a comment).
+  // It is now used in preference to the old body field.
+  StringChange body_change = 31;
+  // body was the old way to change the body, but it doesn't support removing the
+  // body text, which is common on PRs. New mutations use body_change instead.
+  string body = 7;
+
   bool no_milestone = 15; // true unsets any previously-set milestone; false ignored.
   // When setting a milestone, only the milestone_id must be set.
   // TODO: allow num or title to be used if Github only returns those? So far unneeded.
@@ -77,14 +83,21 @@
   repeated GithubReview review = 29;  // new reviews to add
   GithubIssueSyncStatus review_status = 30;
 
-  // Next tag: 31
+  // Next tag: 32
 }
 
 // BoolChange represents a change to a boolean value.
+// (Notably, the wrapper type permits representing a change to false.)
 message BoolChange {
   bool val = 1;
 }
 
+// StringChange represents a change to a boolean value.
+// (Notably, the wrapper type permits representing a change to the empty string.)
+message StringChange {
+  string val = 1;
+}
+
 message GithubLabel {
   int64 id = 1;
   string name = 2;