Disable popwin-mode when a Helm session is active
Disable popwin-mode when a Helm session is active

In many Helm commands, persistent action may open another window to
temporary view its content. For example, execute persistent action in
helm-M-x open a *Help* window for that command. Unfortunately, if
popwin-mode is active, the temporary *Help* buffer is opened below and
Helm's *Help* buffer is opened above by Helm, both show the same
content. Another command is helm-apropos. Since all Helm windows are
effectively temporary already, we do not need popwin in action anymore.

tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs,tsonntag/dotemacs