bug#23882: 25.1: loading some desktops from 24.5 results in horizontal scrollbar everywhere

[Nikolay Kudryavtsev]

I've just tested removing the whole .emacs.d. If it only contains that 
init file(and desktop file after the first load) I still get this bug.

In buggy windows horizontal-scroll-bar-mode is nil, but 
horizontal-scroll-bar is t. Doing M-x horizontal-scroll-bar-mode first 
results in "Horizontal-Scroll-Bar mode enabled" message and 
horizontal-scroll-bar-mode set to t. The second time it gets set to nil 
and the scrollbar disappears. After that I can close 25, open 24 again 
with this desktop, then open 25 again and there would be no problem.

After finding out that, I compared the broken desktop file with a 
working one and found that this is caused by having 
(horizontal-scroll-bars . t)

But then the question was, why it was only triggered with 
initial-buffer-choice.

So, in the end I've found that there are two requirements for this bug:

1. Desktop file should contain (horizontal-scroll-bars . t)

2. (buffer) form in the desktop file should have some other name than 
"*scratch*".

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Best Regards,
Nikolay Kudryavtsev