Make popwin don't treat the only window as popup.

[zk-phi]

When the user invoked delete-other-windows command to enlarge the popup window, for example, we should no longer treat the only window as a popup I think.

[m2ym]

I don't understand what "treat the only window as popup" means.

[zk-phi]

"There're no other windows than the popwin:popup-window", I mean.

One may want to enlarge the popup window by killing all other windows (delete-other-windows) and it produces the condition. A problem is, that unintuitively the only window is still a popup window (that is, (eq (selected-window) popwin:popup-window)), so it can unexpectedly closed or reused by popwin later. For example, when I split the window and switch to the new window, then the old one is closed.

1. M-x popwin:popup-buffer *scratch*[RET]
2. C-x 1 (delete-other-windows)
3. C-x 2 (split-window-below)
4. C-x o (other-window)
5. → the window is closed (unexpectedly)

I think this is not very intuitive behavior, so when there's only one window, popwin should behave as if the popup window is already closed and the only window is no longer a popup.