Good catch. Most of the names in my own library are much shorter than that, so I didn't notice. I'll fix this.
I very much like having the tree when displaying an overview of a large number of libraries. I think it might help if the libraries were expanded automatically once the filtered list is sufficiently short?
Yeah, this is a Windows-specific bug - I think it should be fixed in the next Windows nightly build, but I don't have a good Windows build system set up right now to test quickly. I'll look into it in more depth if the next nightly doesn't fix it.
To me, part of searching for a component is flipping through the search results and looking at their properties. The whole reason I did this was that I find KiCad almost unbearable at the component selection stage without a good overview of the details of a part I'm choosing. Perhaps I will add another resize pane so you can shrink this.
Interesting, I haven't encountered this bug. Can you give me an exact set of steps to reproduce it (including which components you click on)?
See answer to E. Also keep in mind that footprint selection will also be provided here in the future, so it isn't only a preview. The idea is that a component consists of a symbol and a footprint, and it is quite reasonable that someone may wish to immediately refine and place an "0402 resistor" rather than "a resistor", for instance.