[Editor] Avoid to slightly move ink editor when undoing/redoing

src/display/editor/ink.js

@@ -162,11 +162,11 @@ class InkEditor extends AnnotationEditor {
     this.parent.addCommands({
       cmd: () => {
         this.thickness = thickness;
-        this.#fitToContent(/* thicknessChanged = */ true);
+        this.#fitToContent();
       },
       undo: () => {
         this.thickness = savedThickness;
-        this.#fitToContent(/* thicknessChanged = */ true);
+        this.#fitToContent();
       },
       mustExec: true,
       type: AnnotationEditorParamsType.INK_THICKNESS,
@@ -478,7 +478,7 @@ class InkEditor extends AnnotationEditor {
     this.#disableEditing = true;
     this.div.classList.add("disabled");
 
-    this.#fitToContent();
+    this.#fitToContent(/* firstTime = */ true);
 
     this.parent.addInkEditorIfNeeded(/* isCommitting = */ true);
 
@@ -928,7 +928,7 @@ class InkEditor extends AnnotationEditor {
    * the bounding box of the contents.
    * @returns {undefined}
    */
-  #fitToContent(thicknessChanged = false) {
+  #fitToContent(firstTime = false) {
     if (this.isEmpty()) {
       return;
     }
@@ -965,9 +965,7 @@ class InkEditor extends AnnotationEditor {
     this.#realHeight = height;
 
     this.setDims(width, height);
-    const unscaledPadding = thicknessChanged
+    const unscaledPadding = firstTime ? padding / this.scaleFactor / 2 : 0;
-      ? 0
-      : padding / this.scaleFactor / 2;
     this.translate(
       prevTranslationX - this.translationX - unscaledPadding,
       prevTranslationY - this.translationY - unscaledPadding

test/integration/ink_editor_spec.js

@@ -74,5 +74,65 @@ describe("Editor", () => {
         })
       );
     });
+
+    it("must draw, undo/redo and check that the editor don't move", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await page.keyboard.down("Control");
+          await page.keyboard.press("a");
+          await page.keyboard.up("Control");
+
+          await page.keyboard.press("Backspace");
+
+          const rect = await page.$eval(".annotationEditorLayer", el => {
+            // With Chrome something is wrong when serializing a DomRect,
+            // hence we extract the values and just return them.
+            const { x, y } = el.getBoundingClientRect();
+            return { x, y };
+          });
+
+          const xStart = rect.x + 300;
+          const yStart = rect.y + 300;
+          await page.mouse.move(xStart, yStart);
+          await page.mouse.down();
+          await page.mouse.move(xStart + 50, yStart + 50);
+          await page.mouse.up();
+
+          await page.keyboard.press("Escape");
+
+          const rectBefore = await page.$eval(".inkEditor canvas", el => {
+            const { x, y } = el.getBoundingClientRect();
+            return { x, y };
+          });
+
+          for (let i = 0; i < 30; i++) {
+            await page.keyboard.down("Control");
+            await page.keyboard.press("z");
+            await page.keyboard.up("Control");
+
+            await page.waitForTimeout(10);
+
+            await page.keyboard.down("Control");
+            await page.keyboard.press("y");
+            await page.keyboard.up("Control");
+
+            await page.waitForTimeout(10);
+          }
+
+          const rectAfter = await page.$eval(".inkEditor canvas", el => {
+            const { x, y } = el.getBoundingClientRect();
+            return { x, y };
+          });
+
+          expect(Math.round(rectBefore.x))
+            .withContext(`In ${browserName}`)
+            .toEqual(Math.round(rectAfter.x));
+
+          expect(Math.round(rectBefore.y))
+            .withContext(`In ${browserName}`)
+            .toEqual(Math.round(rectAfter.y));
+        })
+      );
+    });
   });
 });