fix: double lineJump in zen mode (@nadalaba) (#7799)

![doubleJump](https://github.com/user-attachments/assets/37b3b849-85be-4bd3-87cd-941b48645f49)

Author: nadalaba

frontend/src/ts/test/test-ui.ts

@@ -81,8 +81,9 @@ const resultWordsHistoryEl = qsr(".pageTest #resultWordsHistory");
 
 export let activeWordTop = 0;
 export let activeWordHeight = 0;
-export let lineTransition = false;
-export let currentTestLine = 0;
+let wordTopBeforeLineJump = 0;
+let lineTransition = false;
+let currentTestLine = 0;
 export let resultCalculating = false;
 
 export function setResultCalculating(val: boolean): void {
@@ -900,7 +901,14 @@ export async function updateWordLetters({
         if (!Config.showAllLines) {
           const wordTopAfterUpdate = wordAtIndex.getOffsetTop();
           if (wordTopAfterUpdate > activeWordTop) {
-            await lineJump(activeWordTop, true);
+            let jump = false;
+            if (!lineTransition) {
+              wordTopBeforeLineJump = wordTopAfterUpdate;
+              jump = true;
+            } else if (wordTopAfterUpdate > wordTopBeforeLineJump) {
+              jump = true;
+            }
+            if (jump) await lineJump(activeWordTop);
           }
         }
       }
@@ -1160,19 +1168,13 @@ function removeTestElements(lastElementIndexToRemove: number): void {
 
 let currentLinesJumping = 0;
 
-export async function lineJump(
-  currentTop: number,
-  force = false,
-): Promise<void> {
+async function lineJump(currentTop: number, force = false): Promise<void> {
   //last word of the line
   if (currentTestLine > 0 || force) {
     const hideBound = currentTop;
 
     const activeWordEl = getActiveWordElement();
-    if (!activeWordEl) {
-      // resolve();
-      return;
-    }
+    if (!activeWordEl) return;
 
     // index of the active word in all #words.children
     // (which contains .word/.newline/.beforeNewline/.afterNewline elements)