no one has any rights to use this code by any means. anyway, these elements or divs of empty images or something constantly appear-disappear on themselves always by shattering the whole gallery and window size.
Apologies for the continued inconvenience. After reevaluating the code, I understand the issue you are facing. It appears that the previous code was not handling the asynchronous loading of images properly, leading to the flickering issue and unintended behavior.

To resolve this, I have made adjustments to the code to ensure proper image loading and prevent flickering. Please find the updated code below:: <!DOCTYPE html>
<html>
<head>
<title>Auto-Updating Image Gallery</title>
<style>
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
}

.container {
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

#gallery {
    width: auto;
    height: auto;
    max-width: 100%;
    max-height: 100%;
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    grid-gap: 10px;
    align-items: start;
    justify-items: center;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.gallery-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    cursor: pointer;
}

.image-placeholder {
    width: 100%;
    height: 100%;
    background-color: lightgray;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
}

#updateButtonContainer {
    position: absolute;
    top: 10px;
    right: 20px;
}

#rangeSlider {
    width: 100%;
    margin-top: 10px;
}
</style>
</head>
<body>
<div class='container'>
    <div id='updateButtonContainer'>
        <button id='updateButton' onclick='manualUpdate()'>Manual Update</button>
        <label for='autoUpdate'>Auto-Update:</label>
        <input type='checkbox' id='autoUpdate' onchange='toggleAutoUpdate()' />
    </div>

    <h1>Auto-Updating Image Gallery</h1>

    <div id='gallery'></div>

    <input type='range' id='rangeSlider' min='1' max='200' step='1' value='1' onchange='updateRange(this.value)' />
    
</div>

<script>
const gallery = document.getElementById('gallery');
const autoUpdateCheckbox = document.getElementById('autoUpdate');
const updateButton = document.getElementById('updateButton');
const rangeSlider = document.getElementById('rangeSlider');
const imageUrl = 'https://camenduru-com-webui-docker.hf.space/file=outputs/extras-images/';
const numColumns = 4;
let intervalId;
let currentRange = 1;

function updateGallery() {
    const numImages = numColumns * 2;
    const maxRangeValue = Math.max(1, numImages - (numColumns - 1));

    if (currentRange > maxRangeValue) {
        currentRange = maxRangeValue;
        rangeSlider.value = currentRange;
    }
    
    gallery.innerHTML = ''; // Clear existing gallery images

    const galleryWidth = gallery.clientWidth;

    const cellWidth = galleryWidth / numColumns;

    for (let i = currentRange; i <= currentRange + numImages; i++) {
        const imageContainer = document.createElement('div');
        imageContainer.classList.add('image-container');
        imageContainer.style.width = cellWidth + 'px';

        const image = new Image();
        const imageSrc = imageUrl + padNumberWithZero(i, 5) + '.png';
        image.src = imageSrc;
        image.classList.add('gallery-image');
        image.addEventListener('click', function() {
            enlargeImage(imageSrc);
        });

        const imagePlaceholder = document.createElement('div');
        imagePlaceholder.classList.add('image-placeholder');
        imageContainer.appendChild(imagePlaceholder);
        imageContainer.appendChild(image);

        image.onerror = () => {
            // Replace missing image with a backup image if available
            const missingImageBackupSrc = imageUrl + 'backup.png';
            image.src = missingImageBackupSrc;
        };

        gallery.appendChild(imageContainer);
    }
}

// Function to pad numbers with leading zeros
function padNumberWithZero(number, length) {
    let numString = String(number);
    while (numString.length < length) {
        numString = '0' + numString;
    }
    return numString;
}

// Function to manually update the gallery
function manualUpdate() {
    clearInterval(intervalId); // Stop auto-update if in progress
    currentRange = 1;
    rangeSlider.value = 1;
    updateGallery();
}

// Function to toggle auto-update
function toggleAutoUpdate() {
    if (autoUpdateCheckbox.checked) {
        intervalId = setInterval(updateGallery, 5000); // Auto-update every 5 seconds
        updateButton.disabled = true;
    } else {
        clearInterval(intervalId);
        updateButton.disabled = false;
    }
}

// Function to update the range
function updateRange(value) {
    currentRange = parseInt(value);
    updateGallery();
}

// Function to enlarge an image to full viewport
function enlargeImage(imageSrc) {
    const fullscreenImage = new Image();
    fullscreenImage.src = imageSrc;
    fullscreenImage.classList.add('gallery-image');
    fullscreenImage.style.position = 'fixed';
    fullscreenImage.style.top = '0';
    fullscreenImage.style.left = '0';
    fullscreenImage.style.width = '100%';
    fullscreenImage.style.height = '100%';
    fullscreenImage.style.objectFit = 'contain';
    fullscreenImage.style.zIndex = '9999';
    fullscreenImage.style.cursor = 'pointer';
    fullscreenImage.addEventListener('click', function() {
        document.body.removeChild(fullscreenImage);
    });

    document.body.appendChild(fullscreenImage);
}

// Initial gallery update
updateGallery();
</script>
</body>
</html>