Use non-breakable spaces in options for the choice widget (bug 2026037)

Usual white spaces are collapsed.

Author: calixteman

src/display/annotation_layer.js

@@ -2139,10 +2139,18 @@ class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {
       }
     });
 
+    const fixDisplayValue = (option, value) => {
+      const newValue = value.replaceAll(" ", "\u00A0");
+      option.textContent = newValue;
+      if (newValue !== value) {
+        option.setAttribute("display-value", value);
+      }
+    };
+
     // Insert the options into the choice field.
     for (const option of this.data.options) {
       const optionElement = document.createElement("option");
-      optionElement.textContent = option.displayValue;
+      fixDisplayValue(optionElement, option.displayValue);
       optionElement.value = option.exportValue;
       if (storedData.value.includes(option.exportValue)) {
         optionElement.setAttribute("selected", true);
@@ -2185,7 +2193,8 @@ class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {
     const getItems = event => {
       const options = event.target.options;
       return Array.prototype.map.call(options, option => ({
-        displayValue: option.textContent,
+        displayValue:
+          option.getAttribute("display-value") || option.textContent,
         exportValue: option.value,
       }));
     };
@@ -2239,7 +2248,7 @@ class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {
             const { index, displayValue, exportValue } = event.detail.insert;
             const selectChild = selectElement.children[index];
             const optionElement = document.createElement("option");
-            optionElement.textContent = displayValue;
+            fixDisplayValue(optionElement, displayValue);
             optionElement.value = exportValue;
 
             if (selectChild) {
@@ -2261,7 +2270,7 @@ class ChoiceWidgetAnnotationElement extends WidgetAnnotationElement {
             for (const item of items) {
               const { displayValue, exportValue } = item;
               const optionElement = document.createElement("option");
-              optionElement.textContent = displayValue;
+              fixDisplayValue(optionElement, displayValue);
               optionElement.value = exportValue;
               selectElement.append(optionElement);
             }

test/integration/annotation_spec.mjs

@@ -920,4 +920,50 @@ a dynamic compiler for JavaScript based on our`);
       );
     });
   });
+
+  describe("bug 2026037", () => {
+    let pages;
+
+    beforeEach(async () => {
+      pages = await loadAndWait("bug2026037.pdf", getAnnotationSelector("22R"));
+    });
+
+    afterEach(async () => {
+      await closePages(pages);
+    });
+
+    it("must check that spaces in a choice option display value are preserved", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          // The option's displayValue contains multiple consecutive spaces
+          // ("A        B"). Browsers collapse spaces in textContent, so the
+          // fix stores the original in a "display-value" attribute and uses
+          // non-breaking spaces (\u00A0) in textContent.
+          const displayAttr = await page.$eval(
+            `${getSelector("22R")} option`,
+            el => el.getAttribute("display-value")
+          );
+          expect(displayAttr)
+            .withContext(`In ${browserName}`)
+            .toEqual("A        B");
+
+          const textContent = await page.$eval(
+            `${getSelector("22R")} option`,
+            el => el.textContent
+          );
+          expect(textContent)
+            .withContext(`In ${browserName}`)
+            .toEqual("A\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0\u00A0B");
+
+          const exportValue = await page.$eval(
+            `${getSelector("22R")} option`,
+            el => el.value
+          );
+          expect(exportValue)
+            .withContext(`In ${browserName}`)
+            .toEqual("a        b");
+        })
+      );
+    });
+  });
 });

test/pdfs/.gitignore

@@ -893,3 +893,4 @@
 !text_rise_eol_bug.pdf
 !hello_world_rotated.pdf
 !bug2025674.pdf
+!bug2026037.pdf