zsh: SHARE_HISTORY or INC_APPEND_HISTORY breaks EXTENDED_HISTORY

Question

I would like to both share history across terminals and keep track of elapsed time for history commands. The intuitive way seems to be to use both EXTENDED_HISTORY and SHARE_HISTORY, but this sets all elapsed timestamps to 0 after restarting the shell. Is this the correct way to do it? Is it even possible?

Scenario 1: EXTENDED_HISTORY and SHARE_HISTORY

$ history -Dn | sed 's|\\n|\n      |g'
0:00  cat << EOF > ~/.zshrc
          HISTFILE=~/.zhistory-test
          HISTSIZE=100
          SAVEHIST=100
          setopt EXTENDED_HISTORY
          setopt SHARE_HISTORY # the only change compared to below
      EOF
0:00  exec zsh

0:00sleep 1

0:00  exec zsh

Scenario 2: only EXTENDED_HISTORY

$ history -Dn | sed 's|\\n|\n      |g'
0:00  cat << EOF > ~/.zshrc
          HISTFILE=~/.zhistory-test
          HISTSIZE=100
          SAVEHIST=100
          setopt EXTENDED_HISTORY
      EOF
0:00  exec zsh

0:01sleep 1

0:00  exec zsh

Scenario 3: INC_APPEND_HISTORY and SHARE_HISTORY

Same as scenario 1, but replacing SHARE_HISTORY with INC_APPEND_HISTORY seems to have the same effect.

System info

$ zsh --version

zsh 5.4.2 (x86_64-unknown-linux-musl)

$ ldd /usr/bin/zsh

        /lib/ld-musl-x86_64.so.1 (0x7f0f8b1d8000)
        libcap.so.2 => /lib/libcap.so.2 (0x7f0f8acfa000)
        libncursesw.so.6 => /lib/libncursesw.so.6 (0x7f0f8aa89000)
        libc.so => /lib/ld-musl-x86_64.so.1 (0x7f0f8b1d8000)

$ uname -a

Linux hostname 4.12.13_1 #1 SMP PREEMPT Thu Sep 14 13:15:00 UTC 2017 x86_64 GNU/Linux

$ lsb_release -d

Description:    Void Linux

Answer 1

I tested several ways of trying to share extended history between multiple terminal sessions and this is the one that seems to work flawlessly:

setopt extendedhistory incappendhistorytime
autoload -Uz add-zsh-hook

import-history() {
  # Pop the last history list, so we don't grow the history stack endlessly
  fc -P

  # Initialize a new history list from $HISTFILE (and push it on the history stack).
  fc -p $HISTFILE
}

# Import the history at the start of each new prompt.
add-zsh-hook precmd import-history

Now all you need to do to sync your history in any terminal session is to press Enter.