Delay loading of file list when going through directories

[larsen255]

I sometimes use the cursor keys to navigate in the remote directory list. Unfortunately, when I e.g. go down three directories, FileZilla loads the file list and when I´m already at the third item, FZ jumps back to the first directory.

To improve the handling of this, I propose that FZ only starts getting the file list after e.g. 100 ms. That way you can navigate with the cursor keys withouth FZ interrupting and you still won´t notice a lag when FZ starts to get the file list.