Sitemap search bar in experience manager doesn't work as expected

When a page is selected in the experience manager and the sitemap is open and someone want to search for another page, then the search bar isn't working.
when you want to type something, the sitemap jumps to the current page and the searchbar lost focus. The only way you can search is collapse the list of pages at root level and try to type again.

Steps to Reproduce:

• navigate in brxm to the experience manager
• select a channel with more than 30 pages
• make sure the sitemap tab is selected, not the componenten tab
• select a random page
• navigate to the top in the sitemap tab (there is the searchbar located)
• click in the search bar => automaticaly is the current page selected in the sitemap => unwanted behaviour
• navigate to the top of the sitemap again
• collape the root element => this closes the list of pages in the sitemap
• click in the searchbar => now the searchbar contains the focus and searching is possible