Implement autofit for edit textarea

public/script.js

@@ -849,11 +849,9 @@ export let is_send_press = false; //Send generation
 
 let this_del_mes = -1;
 
-//message editing and chat scroll position persistence
+//message editing
 var this_edit_mes_chname = '';
 var this_edit_mes_id;
-var scroll_holder = 0;
-var is_use_scroll_holder = false;
 
 //settings
 export let settings;
@@ -9727,25 +9725,7 @@ jQuery(async function () {
         chooseBogusFolder($(this), tagId);
     });
 
-    /**
+    const cssAutofit = CSS.supports('field-sizing', 'content');
-     * Sets the scroll height of the edit textarea to fit the content.
-     * @param {HTMLTextAreaElement} e Textarea element to auto-fit
-     */
-    function autoFitEditTextArea(e) {
-        scroll_holder = chatElement[0].scrollTop;
-        e.style.height = '0px';
-        const newHeight = e.scrollHeight + 4;
-        e.style.height = `${newHeight}px`;
-        is_use_scroll_holder = true;
-    }
-    const autoFitEditTextAreaDebounced = debounce(autoFitEditTextArea, debounce_timeout.short);
-    document.addEventListener('input', e => {
-        if (e.target instanceof HTMLTextAreaElement && e.target.classList.contains('edit_textarea')) {
-            const scrollbarShown = e.target.clientWidth < e.target.offsetWidth && e.target.offsetHeight >= window.innerHeight * 0.75;
-            const immediately = (e.target.scrollHeight > e.target.offsetHeight && !scrollbarShown) || e.target.value === '';
-            immediately ? autoFitEditTextArea(e.target) : autoFitEditTextAreaDebounced(e.target);
-        }
-    });
     const chatElementScroll = document.getElementById('chat');
     const chatScrollHandler = function () {
         if (power_user.waifuMode) {
@@ -9767,12 +9747,26 @@ jQuery(async function () {
     };
     chatElementScroll.addEventListener('wheel', chatScrollHandler, { passive: true });
     chatElementScroll.addEventListener('touchmove', chatScrollHandler, { passive: true });
-    chatElementScroll.addEventListener('scroll', function () {
+
-        if (is_use_scroll_holder) {
+    if (!cssAutofit) {
-            this.scrollTop = scroll_holder;
+        /**
-            is_use_scroll_holder = false;
+         * Sets the scroll height of the edit textarea to fit the content.
+         * @param {HTMLTextAreaElement} e Textarea element to auto-fit
+         */
+        function autoFitEditTextArea(e) {
+            e.style.height = '0px';
+            const newHeight = e.scrollHeight + 4;
+            e.style.height = `${newHeight}px`;
+        }
+        const autoFitEditTextAreaDebounced = debounce(autoFitEditTextArea, debounce_timeout.short);
+        document.addEventListener('input', e => {
+            if (e.target instanceof HTMLTextAreaElement && e.target.classList.contains('edit_textarea')) {
+                const scrollbarShown = e.target.clientWidth < e.target.offsetWidth && e.target.offsetHeight >= window.innerHeight * 0.75;
+                const immediately = (e.target.scrollHeight > e.target.offsetHeight && !scrollbarShown) || e.target.value === '';
+                immediately ? autoFitEditTextArea(e.target) : autoFitEditTextAreaDebounced(e.target);
+            }
+        });
     }
-    }, { passive: true });
 
     $(document).on('click', '.mes', function () {
         //when a 'delete message' parent div is clicked
@@ -10517,8 +10511,10 @@ jQuery(async function () {
             let edit_textarea = $(this)
                 .closest('.mes_block')
                 .find('.edit_textarea');
+            if (!cssAutofit) {
                 edit_textarea.height(0);
                 edit_textarea.height(edit_textarea[0].scrollHeight);
+            }
             edit_textarea.focus();
             edit_textarea[0].setSelectionRange(     //this sets the cursor at the end of the text
                 String(edit_textarea.val()).length,

public/scripts/RossAscends-mods.js

@@ -890,9 +890,6 @@ export function initRossMods() {
     const cssAutofit = CSS.supports('field-sizing', 'content');
 
     if (cssAutofit) {
-        sendTextArea.style['fieldSizing'] = 'content';
-        sendTextArea.style['height'] = 'auto';
-
         let lastHeight = chatBlock.offsetHeight;
         const chatBlockResizeObserver = new ResizeObserver((entries) => {
             for (const entry of entries) {
@@ -919,6 +916,8 @@ export function initRossMods() {
         saveUserInputDebounced();
 
         if (cssAutofit) {
+            // Unset modifications made with a manual resize
+            sendTextArea.style.height = 'auto';
             return;
         }
 

public/style.css

@@ -1264,6 +1264,7 @@ button {
     text-shadow: 0px 0px calc(var(--shadowWidth) * 1px) var(--SmartThemeShadowColor);
     flex: 1;
     order: 3;
+    field-sizing: content;
 
     --progColor: rgb(146, 190, 252);
     --progFlashColor: rgb(215, 136, 114);
@@ -4111,6 +4112,7 @@ input[type="range"]::-webkit-slider-thumb {
     line-height: calc(var(--mainFontSize) + .25rem);
     max-height: 75vh;
     max-height: 75dvh;
+    field-sizing: content;
 }
 
 #anchor_order {