From 279f2be6d400fc8b7e1ca94c2691851fe3c523ef Mon Sep 17 00:00:00 2001
From: Anton Lavrevov <lavrton@gmail.com>
Date: Sat, 8 Nov 2025 09:01:40 -0500
Subject: [PATCH] Fixed line-through rendering when letter spacing is used

---
 src/shapes/Text.ts     |  8 ++++++--
 test/unit/Text-test.ts | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 2 deletions(-)

diff --git a/src/shapes/Text.ts b/src/shapes/Text.ts
index 603746b9..5fcd6439 100644
--- a/src/shapes/Text.ts
+++ b/src/shapes/Text.ts
@@ -318,7 +318,9 @@ export class Text extends Shape<TextConfig> {
         context.stroke();
         context.restore();
       }
-      // draw line-through above the text content
+
+      // store the starting x position for line-through which is drawn after text
+      const lineThroughStartX = lineTranslateX;
 
       // As `letterSpacing` isn't supported on Safari, we use this polyfill.
       // The exception is for RTL text, which we rely on native as it cannot
@@ -380,6 +382,7 @@ export class Text extends Shape<TextConfig> {
 
         context.fillStrokeShape(this);
       }
+
       // draw line-through above the text content
       if (shouldLineThrough) {
         context.save();
@@ -387,7 +390,7 @@ export class Text extends Shape<TextConfig> {
         const yOffset = !Konva.legacyTextRendering
           ? -Math.round(fontSize / 4)
           : 0;
-        const x = align === JUSTIFY ? 0 : lineTranslateX;
+        const x = lineThroughStartX;
         context.moveTo(x, translateY + lineTranslateY + yOffset);
         const lineWidth =
           align === JUSTIFY && !lastLine ? totalWidth - padding * 2 : width;
@@ -402,6 +405,7 @@ export class Text extends Shape<TextConfig> {
         context.stroke();
         context.restore();
       }
+
       context.restore();
       if (textArrLen > 1) {
         translateY += lineHeightPx;
diff --git a/test/unit/Text-test.ts b/test/unit/Text-test.ts
index 2f4852d1..64beaf1d 100644
--- a/test/unit/Text-test.ts
+++ b/test/unit/Text-test.ts
@@ -1966,4 +1966,41 @@ describe('Text', function () {
       );
     }
   });
+
+  it('text decoration with letterSpacing and lineHeight', function () {
+    var stage = addStage();
+    var layer = new Konva.Layer();
+
+    var text = new Konva.Text({
+      x: 10,
+      y: 10,
+      text: 'hello\nworld',
+      fontSize: 40,
+      fill: 'red',
+      letterSpacing: 5,
+      lineHeight: 2,
+      textDecoration: 'underline line-through',
+    });
+
+    layer.add(text);
+    stage.add(layer);
+
+    var trace = layer.getContext().getTrace(false, true);
+    if (Konva._renderBackend === 'web') {
+      assert.equal(
+        trace,
+        'clearRect(0,0,578,200);save();transform(1,0,0,1,10,10);font=normal normal 40px Arial;textBaseline=alphabetic;textAlign=left;translate(0,0);save();save();beginPath();moveTo(0,64);lineTo(110,64);stroke();restore();fillStyle=red;fillText(h,0,54);fillStyle=red;fillText(e,27,54);fillStyle=red;fillText(l,54,54);fillStyle=red;fillText(l,68,54);fillStyle=red;fillText(o,82,54);save();beginPath();moveTo(0,44);lineTo(110,44);stroke();restore();restore();save();save();beginPath();moveTo(0,144);lineTo(121,144);stroke();restore();fillStyle=red;fillText(w,0,134);fillStyle=red;fillText(o,33,134);fillStyle=red;fillText(r,61,134);fillStyle=red;fillText(l,79,134);fillStyle=red;fillText(d,93,134);save();beginPath();moveTo(0,124);lineTo(121,124);stroke();restore();restore();restore();'
+      );
+    } else if (Konva._renderBackend === 'node-canvas') {
+      assert.equal(
+        trace,
+        'clearRect(0,0,578,200);save();transform(1,0,0,1,10,10);font=normal normal 40px Arial;textBaseline=alphabetic;textAlign=left;translate(0,0);save();save();beginPath();moveTo(0,64);lineTo(110,64);stroke();restore();fillStyle=red;fillText(h,0,54);fillStyle=red;fillText(e,27,54);fillStyle=red;fillText(l,54,54);fillStyle=red;fillText(l,68,54);fillStyle=red;fillText(o,82,54);save();beginPath();moveTo(0,44);lineTo(110,44);stroke();restore();restore();save();save();beginPath();moveTo(0,144);lineTo(121,144);stroke();restore();fillStyle=red;fillText(w,0,134);fillStyle=red;fillText(o,33,134);fillStyle=red;fillText(r,61,134);fillStyle=red;fillText(l,79,134);fillStyle=red;fillText(d,93,134);save();beginPath();moveTo(0,124);lineTo(121,124);stroke();restore();restore();restore();'
+      );
+    } else {
+      assert.equal(
+        trace,
+        'clearRect(0,0,578,200);save();transform(1,0,0,1,10,10);font=normal normal 40px Arial;textBaseline=alphabetic;textAlign=left;translate(0,0);save();save();beginPath();moveTo(0,63);lineTo(110,63);stroke();restore();fillStyle=red;fillText(h,0,53);fillStyle=red;fillText(e,27,53);fillStyle=red;fillText(l,54,53);fillStyle=red;fillText(l,68,53);fillStyle=red;fillText(o,82,53);save();beginPath();moveTo(0,43);lineTo(110,43);stroke();restore();restore();save();save();beginPath();moveTo(0,143);lineTo(121,143);stroke();restore();fillStyle=red;fillText(w,0,133);fillStyle=red;fillText(o,33,133);fillStyle=red;fillText(r,61,133);fillStyle=red;fillText(l,79,133);fillStyle=red;fillText(d,93,133);save();beginPath();moveTo(0,123);lineTo(121,123);stroke();restore();restore();restore();'
+      );
+    }
+  });
 });