Don't auto-adjust scroll height if not in viewport

public/scripts/extensions/stable-diffusion/index.js

@@ -712,6 +712,10 @@ function onChatChanged() {
 }
 
 function adjustElementScrollHeight(){
+    if (!$('.sd_settings').is(':visible')) {
+        return;
+    }
+
     resetScrollHeight($('#sd_prompt_prefix'));
     resetScrollHeight($('#sd_negative_prompt'));
     resetScrollHeight($('#sd_character_prompt'));

public/scripts/utils.js

@@ -292,6 +292,9 @@ export function throttle(func, limit = 300) {
  * @returns {boolean} True if the element is in the viewport, false otherwise.
  */
 export function isElementInViewport(el) {
+    if (!el) {
+        return false;
+    }
     if (typeof jQuery === 'function' && el instanceof jQuery) {
         el = el[0];
     }