Small UX improvements

[t1m0thyj]

1. Add ellipsis to preview caption text

   Before

   After

2. Skip preview for unknown windows like Chrome find bar

   

3. ~~Hide preview when dock icon is clicked~~

   // We want to hide the preview if you click anywhere outside of the preview.
   // The only exception is if we're clicking on the dock, otherwise it will flicker
   // the preview and show it again.
   

   ~~I removed the block of code associated with this comment and now the preview hides as expected. I haven't seen any flickering issues so far but am probably missing something.~~

[PepsRyuu]

Can you expand on issue number 3 there?

To explain the thought process behind this block of code:

• Move mouse over dock app icon, preview appears.
• Click on dock app icon, preview disappears.
• Move mouse slightly on the same dock icon, preview reappears.
• Typical mouse movement would involve a click and slight movement of the mouse to interact with the app, therefore causing a flicker.

So the idea is that if you're on the dock, we just disable the hide function entirely. Are you experiencing something different?