emacs-vterm 清屏时把当前屏内容真的丢了，回滚不出来了

Dieken · 2021 年9 月 29 日 06:31

当前屏幕有内容时，清屏，会发现当前屏内容没有进入 scroll buffer，能 scroll back 看到清屏之前上一屏的内容，但是再也看不到清屏之前当前屏的内容了。

Trouble with vterm-clear affecting buffer history

opened 11:15PM - 14 Sep 21 UTC

First, thanks for the great package. I'm having trouble with `vterm-clear` de…stroying buffer history in strange ways. I currently have `vterm-clear-scrollback-when-clearing` set to `nil`, so `vterm-clear` is not calling `vterm-clear-scrollback` directly. However, the odd behavior I'm seeing can be described in two scenarios: 1. If I open a new `vterm` buffer and type some commands whose output does not cause the buffer to scroll (e.g., `pwd`), and then type either `C-l`, `M-x vterm-clear`, or `M-x vterm-send-C-l`, the buffer is cleared and scrollback is cleared. I'm effectively seeing the same behavior as if I had run `C-c C-l`. 2. If I open a new `vterm` buffer and type some commands whose output does cause the buffer to scroll (e.g., `find /`), and then type either `C-l`, `M-x vterm-clear`, or `M-x vterm-send-C-l`, the buffer is cleared as expected but scrollback is not cleared and I can move point up to see previous lines. However, at this point if I type subsequent commands which do not cause the buffer to scroll (e.g., `pwd`) and then again type `C-l`, the history of my last (short output) command is lost. When I scroll up I only see the original command and its output which caused the buffer to scroll (in my example, `find /`). Thanks for any assistance. OS: macOS 10.15.7 Emacs: 27.2 Emacs-libvterm: [sha 2681120](https://github.com/akermu/emacs-libvterm/commit/2681120b770573044832ba8c22ccbac192e1a294) (current origin/master HEAD) libvterm: I let the libvterm package install its own version