Better path presentation in quick open window

[Gephery]

The way a file path is being presented in quick open window makes it sometimes hard to realise which file to pick. Let's consider two files:

some_project/some_longer_pathsome_longer_pathsome_longer_pathsome_longer_path/fruits/apples/Main.js
some_project/some_longer_pathsome_longer_pathsome_longer_pathsome_longer_path/fruits/bananas/Main.js
If we type "Main" in searchbox the list of results shows only begining of paths and the filenames and it looks ... excactly the same. At this point we have to randomly pick one of the files to check if it's the one we'd like especially since there's no preview editor triggered while navigating through result list (microsoft/vscode#8939).

The solution is to present the ending of a path rather than begining, just like it's done in Sublime Text (please notice where ellipsis is added):

Additionally path could be presented in a separate line for more clarity.

microsoft/vscode#143956 (comment)

[Gephery]

Fixed and tested in Commit 404039e

Small preference variation on the enhancement. It will collapse on the left, eliminating folders not single chars.