Sticky tool windows for a project.

[dm1try]

+----------------------------+
|                            |
|                            |
|                            |
|                            |
|                            |
|                            |
|                            |
+---------------+------------+
| iex(1)>...    | warn: tada |
|               |            |
+---------------+------------+
+----------------------------+
|                            |
|   +---------------+        |
|                            |
|                            |
|                            |
|                            |
|                            |
+---------------+------------+
|~ git status   | %{eval:    |
|               |   "result"}|
+---------------+------------+

Beside standard interactions(hide/show), client code should be able to "stick" a buffer into a specific position, create and reuse it depend on current context(a running host app/a performed action).