[AlloyMVC] Can't select/delete texts by using mouse or Delete key in String property

Steps to reproduce

Steps to reproduce

1. Open AlloyMVC site in Edit View to edit a string property in OPE mode (e.g.: page name/description in Alloy Plan page)
2. Try to select a text (chars or words) by using mouse or double-click --> see issues below
   
3. Try to delete a selected text by pressing Delete/Backspace key --> see issues below

• Press, hold and move mouse to select --> Text is not selectable on page name/description
• Double-click on a word --> Text is not selectable on page name (just selectable on page description)
• Double-click to select a word, then press Delete/Backspace key --> Text is not deleted