Integrate copy-progress floating window inside Files main window

In comparison with the streamlined UX all over elementary OS apps, it feels weird to have a floating window separated from Files main window while copying some files (specilly for long copies, where you have this small window bothering or covering part of other apps a for long time). Also, this affects the blue-dot indicator in Plank.

Wouldn't it make more sense to have an integrated progressing-bar in the left panel from Files' main window? That way you can track the copy progress from Files itself, while performing other tasks without the need of window switching.

---
Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/71657897-integrate-copy-progress-floating-window-inside-files-main-window?utm_campaign=plugin&utm_content=tracker%2F65602118&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F65602118&utm_medium=issues&utm_source=github).