fix: make text area auto-sizing stable (CP: 23.5) (#8215)

Author: sissbruecker

packages/text-area/src/vaadin-text-area.js

@@ -305,13 +305,13 @@ export class TextArea extends ResizeMixin(PatternMixin(InputFieldMixin(ThemableM
       // position while resetting the textareas height. If the textarea had a large height, then removing its height
       // will reset its height to the default of two rows. That might reduce the height of the page, and the
       // browser might adjust the scroll position before we can restore the measured height of the textarea.
-      inputField.style.display = 'block';
       inputField.style.height = inputFieldHeight;
 
       // Fix the input element width so its scroll height isn't affected by host's disappearing scrollbars
       input.style.maxWidth = inputWidth;
 
       // Clear the height of the textarea to allow measuring a reduced scroll height
+      input.style.alignSelf = 'flex-start';
       input.style.height = 'auto';
     }
     this._oldValueLength = valueLength;
@@ -323,7 +323,7 @@ export class TextArea extends ResizeMixin(PatternMixin(InputFieldMixin(ThemableM
 
     // Restore
     input.style.removeProperty('max-width');
-    inputField.style.removeProperty('display');
+    input.style.removeProperty('align-self');
     inputField.style.removeProperty('height');
     inputField.scrollTop = scrollTop;
   }