MC-3560: Implement Editing Text Content Block from the Stage with WYSIWYG turned off completely or by default

Prevent assigning integer value to textarea height when its scroll height is same as minHeight.  Prevents 60px assignment

Author: danmooney2

app/code/Magento/PageBuilder/view/adminhtml/web/js/content-type/text/preview.js

@@ -106,6 +106,14 @@ export default class Preview extends BasePreview {
     private adjustTextareaHeightBasedOnScrollHeight()
     {
         this.textarea.style.height = "";
-        $(this.textarea).height(this.textarea.scrollHeight);
+        
+        const scrollHeight = this.textarea.scrollHeight;
+        const minHeight = parseInt($(this.textarea).css("min-height"), 10);
+
+        if (scrollHeight === minHeight) { // leave height at 'auto'
+            return;
+        }
+
+        $(this.textarea).height(scrollHeight);
     }
 }