Bugfix. Properly resize textarea when text gets removed.

src/converse-chatview.js

@@ -1092,11 +1092,8 @@ converse.plugins.add('converse-chatview', {
             },
 
             inputChanged (ev) {
-                const new_height = ev.target.scrollHeight + 'px';
-                if (ev.target.style.height !== new_height) {
-                    ev.target.style.height = 'auto'; // Fixes weirdness
-                    ev.target.style.height = new_height;
-                }
+                ev.target.style.height = 'auto';
+                ev.target.style.height = ev.target.scrollHeight + 'px';
             },
 
             clearMessages (ev) {