crashes when trying to find the new active pane.
While here, nuke an unused pane flag.
Fixes PR 6160, reported by and a slightly different version of diff tested by
ralf.horstmann at gmx.de.
- SIGUSR1 recreates the socket;
- guesswork to work out if the terminal supports UTF-8;
- a paste key for the command prompt;
- main-horizontal layout to match main-vertical, and options to configure the
size of the large pane;
- clear-history command;
- select-layout command.
terminal to be switched between several different windows and programs
displayed on one terminal be detached from one terminal and moved to another.
ok deraadt pirofti