wrong value in window titlebar after creating new notebook

This has been bugging me since one or two releases ago:

To reproduce:

* Start with clean GNU/Linux system and Zim 0.60. (I used Linux Mint 17 MATE amd64. The bug also happens in Windows.)
* Launch Zim.
* Create a notebook in "~/Temp/sandbox".

Expected result:

* New notebook window opens with titlebar saying "sandbox".

Actual result:

* New notebook window opens with titlebar saying "zim".
* The new window's default size is small. (Can be corrected with normal window manager actions.)
* This notebook is always called "zim" (or "zim.exe" in Windows) in the titlebar until the Zim process is terminated and a new one is started.

Attachments:

* "zim --standalone --debug 2>&1 | tee zim_run_1.log"; "run_1.png"
  Ran with no existing notebooks and freshly deleted "~/.config/zim/notebooks.list"

* "zim --standalone --debug 2>&1 | tee zim_run_2.log"; "run_2.png"
  After creating the notebook and getting the first screenshot, terminated Zim, restarted Zim and opened the existing "sandbox" notebook.