Isolate the "basic operations" freetext editor integration tests

This commit reduces the number of freetext editor integration test suite
failures, in full isolation, from 5 to 0 by fixing the following issues
in the "basic operations" block:

- Most tests relied on the first test to enable freetext editing mode.
  For isolation we now do it explicitly in all tests.
- Most tests relied on the other tests having created editors. For
  isolation we now create the editors explicitly in the tests themselves.
- Most tests relied on previous tests for the editor numbering. For
  isolation we change the editor numbering to the one after initial
  document load. Since we can't have state (editors) from a previous
  test anymore we can remove various `clearAll` calls as well.

test/integration/freetext_editor_spec.mjs

@@ -87,11 +87,11 @@ describe("FreeText Editor", () => {
   describe("FreeText", () => {
     let pages;
 
-    beforeAll(async () => {
+    beforeEach(async () => {
       pages = await loadAndWait("aboutstacks.pdf", ".annotationEditorLayer");
     });
 
-    afterAll(async () => {
+    afterEach(async () => {
       await closePages(pages);
     });
 
@@ -134,7 +134,17 @@ describe("FreeText Editor", () => {
     it("must copy/paste", async () => {
       // Run sequentially to avoid clipboard issues.
       for (const [browserName, page] of pages) {
+        await switchToFreeText(page);
+
+        const rect = await getRect(page, ".annotationEditorLayer");
         const firstEditorSelector = getEditorSelector(0);
+        const data = "Hello PDF.js World !!";
+        await page.mouse.click(rect.x + 100, rect.y + 100);
+        await page.waitForSelector(firstEditorSelector, { visible: true });
+        await page.type(`${firstEditorSelector} .internal`, data);
+        await commit(page);
+        await waitForStorageEntries(page, 1);
+
         await selectEditor(page, firstEditorSelector);
         await copy(page);
         await paste(page);
@@ -168,18 +178,35 @@ describe("FreeText Editor", () => {
     it("must clear all", async () => {
       await Promise.all(
         pages.map(async ([browserName, page]) => {
+          await switchToFreeText(page);
+
+          const rect = await getRect(page, ".annotationEditorLayer");
+          for (const n of [0, 1, 2]) {
+            const editorSelector = getEditorSelector(n);
+            const data = "Hello PDF.js World !!";
+            await page.mouse.click(rect.x + 100 * n, rect.y + 100 * n);
+            await page.waitForSelector(editorSelector, { visible: true });
+            await page.type(`${editorSelector} .internal`, data);
+            await commit(page);
+
+            const hasEditor = await page.evaluate(
+              sel => !!document.querySelector(sel),
+              editorSelector
+            );
+            expect(hasEditor).withContext(`In ${browserName}`).toEqual(true);
+          }
+
+          await waitForStorageEntries(page, 3);
           await clearAll(page);
+          await waitForStorageEntries(page, 0);
 
           for (const n of [0, 1, 2]) {
             const hasEditor = await page.evaluate(
               sel => !!document.querySelector(sel),
               getEditorSelector(n)
             );
-
             expect(hasEditor).withContext(`In ${browserName}`).toEqual(false);
           }
-
-          await waitForStorageEntries(page, 0);
         })
       );
     });
@@ -187,8 +214,10 @@ describe("FreeText Editor", () => {
     it("must check that a paste has been undone", async () => {
       // Run sequentially to avoid clipboard issues.
       for (const [, page] of pages) {
+        await switchToFreeText(page);
+
         const rect = await getRect(page, ".annotationEditorLayer");
-        let editorSelector = getEditorSelector(3);
+        let editorSelector = getEditorSelector(0);
         const data = "Hello PDF.js World !!";
         await page.mouse.click(rect.x + 100, rect.y + 100);
         await page.waitForSelector(editorSelector, { visible: true });
@@ -198,7 +227,7 @@ describe("FreeText Editor", () => {
         await selectEditor(page, editorSelector);
         await copy(page);
         await paste(page);
-        editorSelector = getEditorSelector(4);
+        editorSelector = getEditorSelector(1);
         await page.waitForSelector(editorSelector, { visible: true });
 
         await kbUndo(page);
@@ -210,7 +239,7 @@ describe("FreeText Editor", () => {
 
         for (let i = 0; i < 2; i++) {
           await paste(page);
-          await page.waitForSelector(getEditorSelector(5 + i));
+          await page.waitForSelector(getEditorSelector(2 + i));
         }
 
         for (let i = 0; i < 2; i++) {
@@ -218,7 +247,7 @@ describe("FreeText Editor", () => {
           await page.waitForFunction(
             sel => !document.querySelector(sel),
             {},
-            getEditorSelector(6 - i)
+            getEditorSelector(3 - i)
           );
         }
       }
@@ -227,6 +256,8 @@ describe("FreeText Editor", () => {
     it("must check that aria-owns is correct", async () => {
       await Promise.all(
         pages.map(async ([browserName, page]) => {
+          await switchToFreeText(page);
+
           await page.$eval(".textLayer", el => {
             for (const span of el.querySelectorAll(
               `span[role="presentation"]`
@@ -246,7 +277,7 @@ describe("FreeText Editor", () => {
 
           expect(oldAriaOwns).withContext(`In ${browserName}`).toEqual(null);
 
-          const editorSelector = getEditorSelector(7);
+          const editorSelector = getEditorSelector(0);
           const data = "Hello PDF.js World !!";
           await page.mouse.click(
             stacksRect.x + stacksRect.width + 1,
@@ -261,7 +292,7 @@ describe("FreeText Editor", () => {
             return span?.getAttribute("aria-owns") || null;
           });
 
-          expect(ariaOwns.endsWith("_7-editor"))
+          expect(ariaOwns.endsWith("_0-editor"))
             .withContext(`In ${browserName}`)
             .toEqual(true);
           await scrollIntoView(page, ".annotationEditorLayer");
@@ -272,11 +303,10 @@ describe("FreeText Editor", () => {
     it("must check that right click doesn't select", async () => {
       await Promise.all(
         pages.map(async ([browserName, page]) => {
+          await switchToFreeText(page);
+
           const rect = await getRect(page, ".annotationEditorLayer");
-
+          const editorSelector = getEditorSelector(0);
-          await clearAll(page);
-
-          const editorSelector = getEditorSelector(8);
           const data = "Hello PDF.js World !!";
           await page.mouse.click(rect.x + 100, rect.y + 100);
           await page.waitForSelector(editorSelector, { visible: true });
@@ -285,7 +315,7 @@ describe("FreeText Editor", () => {
 
           expect(await getEditors(page, "selected"))
             .withContext(`In ${browserName}`)
-            .toEqual([8]);
+            .toEqual([0]);
 
           await page.keyboard.press("Escape");
           await page.waitForFunction(
@@ -295,7 +325,7 @@ describe("FreeText Editor", () => {
           await selectEditor(page, editorSelector);
           expect(await getEditors(page, "selected"))
             .withContext(`In ${browserName}`)
-            .toEqual([8]);
+            .toEqual([0]);
 
           // Escape.
           await page.keyboard.press("Escape");
@@ -317,11 +347,10 @@ describe("FreeText Editor", () => {
     it("must check that text change can be undone/redone", async () => {
       // Run sequentially to avoid clipboard issues.
       for (const [browserName, page] of pages) {
+        await switchToFreeText(page);
+
         const rect = await getRect(page, ".annotationEditorLayer");
-
+        const editorSelector = getEditorSelector(0);
-        await clearAll(page);
-
-        const editorSelector = getEditorSelector(9);
         await page.mouse.click(rect.x + 200, rect.y + 100);
         await page.waitForSelector(editorSelector, { visible: true });