I often use the history-feature of Terminal (or bash), where I can navigate to previous commands using the arrow keys. Often this is quite helpful when the previous command was somehow wrong, and you just wand to correct this small error, instead of re-writing the whole command again. However when line-breaks are involved, I quite often experience that Terminal gets confused. Once I've edited a command in the history-buffer and press the enter-key, the command executed does not equal the command I was shown on screen while editing it. I'll try to find illustrative examples and ways to reproduce this issue.
I see this problem far too often, you hit the up arrow on a command that spans more then 1 line, move into the line to edit and press return. The command that you saw and edit does not match the command that is edited. The insertion point the terminal shows is not the same as the insertion point the tty sees. I haven't been able to figure out what the trigger is. It is not something like utf-8 handling, it happens when editing strings with only 7-bit characters. Issuing a refresh with 'ctrl-l' will repaint the line and the repaint will be correct, but the only way to know there was a problem is to execute the command and have it do something wrong. In my opinion this is a *very* serious bug, because it could easily result in something nasty (think editing a command with 'rm -rf'). I think there are a number of refresh/repaint related bugs in xfce4-terminal, I have noticed when splitting the screen in vile or vim that sometimes the screen will not repaint correctly, a ctrl-l is needed to recover. I don't ever recall having issues with this with xterm, gnome-terminal or xwsh.
I don't think it's a bug with Vte-2 (the one current xfce4-terminal uses), and I'm quite certain there's no such bug in Vte-3 (to which xfce should upgrade). The issue usually boild down to one of these: - The previous command's output didn't end with newline. Either get used to pressing an Enter, or see a workaround here: https://bugs.launchpad.net/ubuntu/+source/gnome-terminal/+bug/1419339 - Your bash prompt contains unprintable characters (e.g. ANSI color escape sequences) but you forgot to enclose them between \[ and \], as bash documents that it requires so that it can keep track of the cursor position.
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