Resolve "Prevent overflowing content of the tables in the sidebar"

Closes #466 (closed)

The fix

Cancel the propagated click events when releasing the mouse pointer after the element has been moved to another position.

Testing pointers

• When moving a table or database to another position, it should not click that table or database. So if the table is not selected, it should not be selected after moving it to another position.
• Long text in table and database should not be overflowing, but should show Very long table name....
• Only clicking on a table or database should select table or database.