fix(core): preserve legacy falsy canvas sizing

Author: ibgreen

modules/core/src/adapter/canvas-surface.ts

@@ -303,7 +303,8 @@ export abstract class CanvasSurface {
         pixelRatio === undefined ? 'exact' : 'css-dpr'
       );
     } else if ('useDevicePixels' in props && this._usesLegacyDrawingBufferSizing) {
-      this.props.useDevicePixels = props.useDevicePixels ?? false;
+      // Preserve the legacy setter's falsy-value normalization (notably numeric `0`).
+      this.props.useDevicePixels = props.useDevicePixels || false;
       const drawingBufferSizeProps = normalizeLegacyDrawingBufferSizeProps(this.props);
       this._setDrawingBufferSizeProps(
         drawingBufferSizeProps.drawingBufferSizeTracking,

modules/core/test/adapter/canvas-context.spec.ts

@@ -691,6 +691,18 @@ test('CanvasContext#new drawing buffer sizing props override and validate legacy
     'legacy autoResize false normalizes to no tracking'
   );
 
+  legacyNumericCanvasContext.setProps({useDevicePixels: 0});
+  t.equal(
+    legacyNumericCanvasContext.props.useDevicePixels,
+    false,
+    'legacy setProps preserves falsy numeric normalization'
+  );
+  t.equal(
+    legacyNumericCanvasContext.props.pixelRatio,
+    1,
+    'legacy setProps treats a falsy numeric ratio as non-device-pixel sizing'
+  );
+
   const newCanvasContext = new TestCanvasContext(
     {
       drawingBufferSizeTracking: 'canvas',