JS - Handle correctly hierarchy of fields (#13133)

* JS - Handle correctly hierarchy of fields
  - it aims to fix #13132;
  - annotations can inherit their actions from the parent field;
  - there are some fields which act as a container for other fields:
    - they can be access through js so need to add them with an empty type (nothing in the spec about that but checked in Acrobat);
    - calculation order list (CO) can reference them so need make them through this.getField;
    - getArray method must return kids.
  - field values are number, string, ... depending of their type but nothing in the spec on how to know what's the type:
    - according to the comment for Canonical Format: https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#page=461
    - it seems that this "type" can be guessed from js action Format (when setting a type in Acrobat DC, the only affected thing is this action).
  - util.scand with an empty string returns the current date.

test/integration/scripting_spec.js

@@ -695,4 +695,71 @@ describe("Interaction", () => {
       );
     });
   });
+
+  describe("in issue13132.pdf", () => {
+    let pages;
+
+    beforeAll(async () => {
+      pages = await loadAndWait("issue13132.pdf", "#\\31 71R");
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+    });
+
+    it("must compute sum of fields", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await page.waitForFunction(
+            "window.PDFViewerApplication.scriptingReady === true"
+          );
+
+          await page.evaluate(() => {
+            window.document.getElementById("171R").scrollIntoView();
+          });
+
+          let sum = 0;
+          for (const [id, val] of [
+            ["#\\31 38R", 1],
+            ["#\\37 7R", 2],
+            ["#\\39 3R", 3],
+            ["#\\31 51R", 4],
+            ["#\\37 9R", 5],
+          ]) {
+            const prev = await page.$eval("#\\31 71R", el => el.value);
+
+            await page.type(id, val.toString(), { delay: 100 });
+            await page.keyboard.press("Tab");
+
+            await page.waitForFunction(
+              _prev =>
+                getComputedStyle(document.querySelector("#\\31 71R")).value !==
+                _prev,
+              {},
+              prev
+            );
+
+            sum += val;
+
+            const total = await page.$eval("#\\31 71R", el => el.value);
+            expect(total).withContext(`In ${browserName}`).toEqual(`£${sum}`);
+          }
+
+          // Some unrendered annotations have been updated, so check
+          // that they've the correct value when rendered.
+          await page.evaluate(() => {
+            window.document
+              .querySelectorAll('[data-page-number="4"][class="page"]')[0]
+              .scrollIntoView();
+          });
+          await page.waitForSelector("#\\32 99R", {
+            timeout: 0,
+          });
+
+          const total = await page.$eval("#\\32 99R", el => el.value);
+          expect(total).withContext(`In ${browserName}`).toEqual(`£${sum}`);
+        })
+      );
+    });
+  });
 });

test/pdfs/issue13132.pdf.link

@@ -0,0 +1 @@
+https://web.archive.org/web/20210324123420/https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/866023/IHT205_2004-2006.pdf

test/test_manifest.json

@@ -2561,6 +2561,12 @@
        "link": true,
        "type": "load"
     },
+    {  "id": "issue13132",
+       "file": "pdfs/issue13132.pdf",
+       "md5": "1b28964b9188047bc6c786302c95029f",
+       "link": true,
+       "type": "other"
+    },
     {  "id": "issue4722",
        "file": "pdfs/issue4722.pdf",
        "md5": "a42ca858af7d179358f92f47e57c0fed",