See steps to reproduce.

Reproducible: Always

Steps to Reproduce:
1. Go to /usr/share/icons/oxygen
2. Press Ctrl+F to open Dolphin search. Type "document-save" and press Return.
3. Search works as expected, finding many files for different icon sizes.
4. Press Ctrl+T to open a new tab.
Actual Results:  
The new tab is "filesystemsearch" altough it has lost all the search widget except the close one, which does not work.

The search before yielded several different files with the same name for different icon sizes (16x16, 22x22, etc.). Now for whatever reason only the first file of each same-name group appears.

If I click back in the previous tab, the search widgets look OK, but all the files with the same name as 16x16 icons has disappeared there too. Searching for "document-save" again yields the same incorrect results, even after making a different search.

Expected Results:  
It should either not open another search tab (and open the folder in which it was requested in no search mode), or open it but done right.

No incomplete search forms should appear and no files should became invisible until Dolphin restart, like now is happening.