From 817c9684ce2be22f71c01e312f08dce0d7d42efe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20R=C3=BCger?= <manuel@rueg.eu>
Date: Mon, 8 Dec 2025 17:11:20 +0100
Subject: [PATCH] fix: Include scale into the hash

Should fix https://github.com/kovetskiy/mark/issues/683
---
 d2/d2.go                | 11 ++++++++++-
 d2/d2_test.go           |  2 +-
 mermaid/mermaid.go      | 10 +++++++++-
 mermaid/mermaid_test.go |  2 +-
 4 files changed, 21 insertions(+), 4 deletions(-)

diff --git a/d2/d2.go b/d2/d2.go
index d6b85fc..aa2dc89 100644
--- a/d2/d2.go
+++ b/d2/d2.go
@@ -4,7 +4,9 @@ import (
 	"bytes"
 	"context"
 	"encoding/base64"
+	"encoding/binary"
 	"fmt"
+	"math"
 	"strconv"
 	"time"
 
@@ -63,7 +65,14 @@ func ProcessD2(title string, d2Diagram []byte, scale float64) (attachment.Attach
 		return attachment.Attachment{}, err
 	}
 
-	checkSum, err := attachment.GetChecksum(bytes.NewReader(d2Diagram))
+	scaleAsBytes := make([]byte, 8)
+
+	binary.LittleEndian.PutUint64(scaleAsBytes, math.Float64bits(scale))
+
+	d2Bytes := append(d2Diagram, scaleAsBytes...)
+
+	checkSum, err := attachment.GetChecksum(bytes.NewReader(d2Bytes))
+
 	log.Debugf(nil, "Checksum: %q -> %s", title, checkSum)
 
 	if err != nil {
diff --git a/d2/d2_test.go b/d2/d2_test.go
index 043129f..2a50080 100644
--- a/d2/d2_test.go
+++ b/d2/d2_test.go
@@ -75,7 +75,7 @@ func TestExtractD2Image(t *testing.T) {
 			Filename:  "example.png",
 			Name:      "example",
 			Replace:   "example",
-			Checksum:  "58fa387384181445e2d8f90a8c7fda945cb75174f73e8b9853ff59b9e0103ddd",
+			Checksum:  "40e75f93e09da9242d4b1ab8e2892665ec7d5bd1ac78a4b65210ee219cf62297",
 			ID:        "",
 			Width:     "198",
 			Height:    "441",
diff --git a/mermaid/mermaid.go b/mermaid/mermaid.go
index 8fa8b08..80cea1c 100644
--- a/mermaid/mermaid.go
+++ b/mermaid/mermaid.go
@@ -3,6 +3,8 @@ package mermaid
 import (
 	"bytes"
 	"context"
+	"encoding/binary"
+	"math"
 	"strconv"
 	"time"
 
@@ -30,7 +32,13 @@ func ProcessMermaidLocally(title string, mermaidDiagram []byte, scale float64) (
 		return attachment.Attachment{}, err
 	}
 
-	checkSum, err := attachment.GetChecksum(bytes.NewReader(mermaidDiagram))
+	scaleAsBytes := make([]byte, 8)
+
+	binary.LittleEndian.PutUint64(scaleAsBytes, math.Float64bits(scale))
+
+	mermaidBytes := append(mermaidDiagram, scaleAsBytes...)
+
+	checkSum, err := attachment.GetChecksum(bytes.NewReader(mermaidBytes))
 	log.Debugf(nil, "Checksum: %q -> %s", title, checkSum)
 
 	if err != nil {
diff --git a/mermaid/mermaid_test.go b/mermaid/mermaid_test.go
index db087ed..9e87ad3 100644
--- a/mermaid/mermaid_test.go
+++ b/mermaid/mermaid_test.go
@@ -22,7 +22,7 @@ func TestExtractMermaidImage(t *testing.T) {
 			Filename:  "example.png",
 			Name:      "example",
 			Replace:   "example",
-			Checksum:  "1743a4f31ab66244591f06c8056e08053b8e0a554eb9a38709af6e9d145ac84f",
+			Checksum:  "26296b73c960c25850b37bc9dd77cb24fce1a78db83b37755a25af7f8a48cc96",
 			ID:        "",
 			Width:     "87",
 			Height:    "174",