Add test for mouse selection (previously failing in Chrome)

test/integration/highlight_editor_spec.mjs

@@ -1760,4 +1760,64 @@ describe("Highlight Editor", () => {
       );
     });
   });
+
+  describe("Text selection", () => {
+    let pages;
+
+    beforeAll(async () => {
+      pages = await loadAndWait(
+        "tracemonkey.pdf",
+        `.page[data-page-number = "1"] .endOfContent`
+      );
+    });
+
+    afterAll(async () => {
+      await closePages(pages);
+    });
+
+    it("doesn't jump when hovering on an empty area", async () => {
+      await Promise.all(
+        pages.map(async ([browserName, page]) => {
+          const [rectStart, rectEnd] = await Promise.all([
+            getSpanRectFromText(
+              page,
+              1,
+              "(frequently executed) bytecode sequences, records"
+            ),
+            getSpanRectFromText(
+              page,
+              1,
+              "them, and compiles them to fast native code. We call such a se-"
+            ),
+          ]);
+
+          await page.mouse.move(
+            rectStart.x + rectStart.width / 2,
+            rectStart.y + rectStart.height / 2
+          );
+          await page.mouse.down();
+          await page.mouse.move(
+            rectEnd.x + rectEnd.width,
+            rectEnd.y + rectEnd.height * 1.5,
+            { steps: 10 }
+          );
+          await page.mouse.up();
+
+          const selectedText = await page.evaluate(() =>
+            window.getSelection().toString()
+          );
+
+          expect(selectedText)
+            .withContext(`In ${browserName}`)
+            .toBe(
+              browserName === "chrome"
+                ? "code sequences, records\n" +
+                    "them, and compiles them to fast native code. We call such a se-"
+                : "ecode sequences, records\n" +
+                    "them, and compiles them to fast native code. We call such "
+            );
+        })
+      );
+    });
+  });
 });