Use Existing reference dialog box

Steps to reproduce:

1.Open a page with VE
2.Go to Insert>Reference >Use an existing reference
3.Type a search term in the search box
4.Select a reference from the search result.
5.Now again attempt to add another existing reference

Observed Result:
When the page of existing references opens up it still keeps the search term from previous attempt and shows the search results , it should rather clear the previous search term and let user to start over.
This issue also occurs for new media adding dialog

See the screenshots attached.

Test Environment: https://test2.wikipedia.org/
Browser: Chrome Version 26.0.1410.65 & FF 25
OS: MAC OS X 10. 8. 5
Page:http://en.wikipedia.beta.wmflabs.org/wiki/24thfebchrome?veaction=edit

Version: unspecified
Severity: minor

Attached: