test(lazy-sheet): adjust for Firefox

Also:
- Improve comment in tobago-sheet.ts.
- Intro.test.js was failing in both Firefox and Webkit.

tobago-example/tobago-example-demo/src/main/webapp/content/000-intro/Intro.test.js

@@ -20,7 +20,7 @@ import {JasmineTestTool} from "/tobago/test/tobago-test-tool.js";
 
 it("First section title is 'Intro'", function (done) {
   const titleOfFirstSectionHeader = querySelectorFn("tobago-section h1");
-  const introLinkFn = elementByIdFn("page:navigator:nav:1:cmd");
+  const introLinkFn = elementByIdFn("page:navigation:nav:1:cmd");
 
   const test = new JasmineTestTool(done);
   test.setup(() => titleOfFirstSectionHeader().textContent.trim() === "Intro", null, "click", introLinkFn);

tobago-example/tobago-example-demo/src/main/webapp/content/900-test/3000-sheet/83-lazy-columnPanel/Lazy_ColumnPanel.test.js

@@ -15,7 +15,7 @@
  * limitations under the License.
  */
 
-import {elementByIdFn, querySelectorFn} from "/script/tobago-test.js";
+import {elementByIdFn, isFirefox, querySelectorFn} from "/script/tobago-test.js";
 import {JasmineTestTool} from "/tobago/test/tobago-test-tool.js";
 
 it("initial load", function (done) {
@@ -37,7 +37,14 @@ it("focus row index 200 and scroll up", function (done) {
   test.wait(() => Date.now() - timestamp > 200);
   test.do(() => focusRowIndex(200));
   test.wait(() => isLoaded(200));
-  test.do(() => expect(isLoaded(199)).toBeFalse());
+
+  if (isFirefox()) {
+    test.wait(() => isLoaded(199));
+    test.do(() => expect(isLoaded(189)).toBeFalse());
+    test.do(() => expect(isLoaded(190, 199)).toBeTrue());
+  } else {
+    test.do(() => expect(isLoaded(199)).toBeFalse());
+  }
   test.do(() => expect(isLoaded(200, 209)).toBeTrue());
   test.do(() => expect(isLoaded(210)).toBeFalse());
 
@@ -59,15 +66,27 @@ it("focus row index 300 and scroll down", function (done) {
   test.wait(() => Date.now() - timestamp > 200);
   test.do(() => focusRowIndex(300));
   test.wait(() => isLoaded(300));
-  test.do(() => expect(isLoaded(299)).toBeFalse());
+
+  if (isFirefox()) {
+    test.wait(() => isLoaded(299));
+    test.do(() => expect(isLoaded(289)).toBeFalse());
+    test.do(() => expect(isLoaded(290, 299)).toBeTrue());
+  } else {
+    test.do(() => expect(isLoaded(299)).toBeFalse());
+  }
   test.do(() => expect(isLoaded(300, 309)).toBeTrue());
   test.do(() => expect(isLoaded(310)).toBeFalse());
 
   test.do(() => timestamp = Date.now());
   test.wait(() => Date.now() - timestamp > 200);
   test.do(() => focusRowIndex(301));
   test.wait(() => isLoaded(310));
-  test.do(() => expect(isLoaded(299)).toBeFalse());
+  if (isFirefox()) {
+    test.do(() => expect(isLoaded(289)).toBeFalse());
+    test.do(() => expect(isLoaded(290, 299)).toBeTrue());
+  } else {
+    test.do(() => expect(isLoaded(299)).toBeFalse());
+  }
   test.do(() => expect(isLoaded(300, 319)).toBeTrue());
   test.do(() => expect(isLoaded(320)).toBeFalse());
   test.start();

tobago-example/tobago-example-demo/src/main/webapp/content/900-test/3000-sheet/84-lazy-selectable-use-case/lazy-selectable-use-case.test.js

@@ -40,6 +40,7 @@ it("TOBAGO-2349: Lazy sheet: tobago-behavior not initialized", function (done) {
   test.setup(() => name().value === "Sun", null, "click", reset);
 
   test.do(() => focusRowIndex(18));
+  test.wait(() => isLoaded(18, 67));
   test.do(() => expect(isLoaded(18, 67)).toBeTrue());
   test.do(() => timestamp = Number(timestampElement().textContent));
   test.event("click", ajaxButton, () => Number(timestampElement().textContent) > timestamp);

tobago-example/tobago-example-demo/src/main/webapp/script/tobago-test.js

@@ -56,7 +56,11 @@ function activeElementFn() {
   return document.getElementById("page:testframe").contentWindow.document.activeElement;
 }
 
-export {elementByIdFn, querySelectorFn, querySelectorAllFn, activeElementFn};
+function isFirefox() {
+  return navigator.userAgent.toLowerCase().includes('firefox');
+}
+
+export {elementByIdFn, querySelectorFn, querySelectorAllFn, activeElementFn, isFirefox};
 
 beforeEach(function (done) {
   jasmine.DEFAULT_TIMEOUT_INTERVAL = 5 * 60 * 1000; //5 minutes

tobago-theme/tobago-theme-standard/src/main/ts/tobago-sheet.ts

@@ -233,8 +233,8 @@ export class Sheet extends HTMLElement {
       const firstVisibleRow
           = this.tableBody.querySelector<HTMLTableRowElement>(`tr[row-index='${lazyScrollPosition[0]}']`);
       if (firstVisibleRow) {
-        this.sheetBody.scrollTop
-            = firstVisibleRow.offsetTop + lazyScrollPosition[1]; //triggers scroll event -> lazyCheck()
+        this.sheetBody.scrollTop = firstVisibleRow.offsetTop + lazyScrollPosition[1];
+        //in Firefox setting "scrollTop" triggers scroll event -> lazyCheck()
       }
     }
 
@@ -562,6 +562,7 @@ export class Sheet extends HTMLElement {
           = this.tableBody.querySelector<HTMLTableRowElement>(`tr[row-index='${lazyScrollPosition[0]}']`);
       if (firstRow) {
         this.sheetBody.scrollTop = firstRow.offsetTop + lazyScrollPosition[1];
+        //in Firefox setting "scrollTop" triggers scroll event -> lazyCheck()
       }
 
       this.lazyActive = false;