ShellManager: Use vfork instead of fork
When large buffers have been opened, copying Kakoune's memory page descriptors can get pretty slow, making fork more expensive than necessary. vfork avoids that problem. While not strictly conforming, it seems the few calls we do before execve (open, close, dup2 and set_signal_handler) would not cause any problems on platforms we care about.
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@ -107,7 +107,7 @@ pid_t spawn_shell(const char* shell, StringView cmdline,
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execparams.push_back(param.c_str());
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execparams.push_back(nullptr);
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if (pid_t pid = fork())
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if (pid_t pid = vfork())
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return pid;
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setup_child();
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