This change has two implications:
1) tree_render() will now be called precisely once for input which consists of
multiple commands (like "focus left; focus right"). Also, the caller of
parse_command() has to call it. This makes us able to fix tickets such as
ticket #608 (where multiple tree_render() calls are noticable).
2) The output of a command is now a JSON array of return values of the
individual subcommands. In the case of "focus left; focus right", this is:
[{"success":true}, {"success":true}]
While this is incompatible with what i3 returned before, the return value of
commands was undocumented and therefore not subject to our API stability.
This behavior can be avoided by passing dont_create_temp_dir => 1 to
launch_with_config (or activate_i3).
This commit fixes t/159-socketpaths.t being flaky on non-systemd computers.
instead of executing a new perl interpreter (via TAP::Parser)
each time we start a testfile, fork a TestWorker for each display.
Each worker preloads i3test via 'require', blocking waits on its ipc
to get a new filename, forks itself upon arrival and 'do'es this
testscript.
eval 'package foo; use strict;' enables strict within eval, it does
not leak into the surrounding scope.
Also fix various warnings/compile errors found due to now enabled
strict and warnings.
