When used from Chromium to open a file, KDialog can hang for a long time without being responsive to user input (you cannot even close it). This happens at least when the initial directory contains many images (more than 2000 of .jpg, .gif, .png in my case), view is set to "detailed" and preview is enabled.

For whatever reason, the bug _is not_ trigerred when you navigate into this folder from somewhere else, only if this is the very first folder the dialog displays.


Reproducible: Always

Steps to Reproduce:
1. In chromium click "choose file" anywhere, select an image from a huge folder.
2. Now click "choose file" again; Chromium will ask KDialog to start in this huge folder


Actual Results:  
The dialog hangs without reacting to user commands for a long time, though eventually it starts working.

Expected Results:  
The dialog should respond to commands, e.g. if I want to navigate to the folder one level above. It should run any lengthy computations in the background.

Don't know how to find version, bug e.g. kde-baseapps package is version 4.14.2 here.

If you click on window "close" button, KDE prompts (after a few seconds): "Application "kdialog" is not responding".