Preserve the whitespaces when getting text from FreeText annotations (bug 1871353)

When the text of an annotation is extracted in using getTextContent, consecutive white spaces
are just replaced by one space and. So this patch add an option to make sure that white
spaces are preserved when appearance is parsed.
For the case where there's no appearance, we can have a fast path to get the correct string
from the Content entry.
When an existing FreeText is edited, space (0x20) are replaced by non-breakable (0xa0) ones
to make to see all of them on screen.

test/integration/freetext_editor_spec.mjs

@@ -209,11 +209,11 @@ describe("FreeText Editor", () => {
         await waitForStorageEntries(page, 2);
 
         const content = await page.$eval(getEditorSelector(0), el =>
-          el.innerText.trimEnd()
+          el.innerText.trimEnd().replaceAll("\xa0", " ")
         );
 
         let pastedContent = await page.$eval(getEditorSelector(1), el =>
-          el.innerText.trimEnd()
+          el.innerText.trimEnd().replaceAll("\xa0", " ")
         );
 
         expect(pastedContent).withContext(`In ${browserName}`).toEqual(content);
@@ -225,7 +225,7 @@ describe("FreeText Editor", () => {
         await waitForStorageEntries(page, 3);
 
         pastedContent = await page.$eval(getEditorSelector(2), el =>
-          el.innerText.trimEnd()
+          el.innerText.trimEnd().replaceAll("\xa0", " ")
         );
         expect(pastedContent).withContext(`In ${browserName}`).toEqual(content);
       }
@@ -3182,4 +3182,68 @@ describe("FreeText Editor", () => {
       );
     });
   });
+
+  describe("Consecutive white spaces in Freetext without appearance", () => {
+    let pages;
+
+    beforeAll(async () => {
+      pages = await loadAndWait("bug1871353.pdf", ".annotationEditorLayer");
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+    });
+
+    it("must check that consecutive white spaces are preserved when a freetext is edited", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await switchToFreeText(page);
+          await page.click(getEditorSelector(0), { count: 2 });
+          await page.type(`${getEditorSelector(0)} .internal`, "C");
+
+          await page.click("#editorFreeText");
+          await page.waitForSelector(
+            `.annotationEditorLayer:not(.freetextEditing)`
+          );
+
+          const [value] = await getSerialized(page, x => x.value);
+          expect(value)
+            .withContext(`In ${browserName}`)
+            .toEqual("CA          B");
+        })
+      );
+    });
+  });
+
+  describe("Consecutive white spaces in Freetext with appearance", () => {
+    let pages;
+
+    beforeAll(async () => {
+      pages = await loadAndWait("bug1871353.1.pdf", ".annotationEditorLayer");
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+    });
+
+    it("must check that consecutive white spaces are preserved when a freetext is edited", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          await switchToFreeText(page);
+          await page.click(getEditorSelector(0), { count: 2 });
+          await page.type(`${getEditorSelector(0)} .internal`, "Z");
+
+          await page.click("#editorFreeText");
+          await page.waitForSelector(
+            `.annotationEditorLayer:not(.freetextEditing)`
+          );
+
+          const [value] = await getSerialized(page, x => x.value);
+          expect(value)
+            .withContext(`In ${browserName}`)
+            .toEqual("ZX          Y");
+        })
+      );
+    });
+  });
 });

test/pdfs/.gitignore

@@ -621,3 +621,5 @@
 !bug1863910.pdf
 !bug1865341.pdf
 !bug1872721.pdf
+!bug1871353.pdf
+!bug1871353.1.pdf