The Ctrl+Z cause some text remain on screen

[doggy8088]

When I using Cmder, I met this problem long time ago. When I paste a text with Ctrl+V onto the Console, then press Ctrl+Z (undo). The first character will remain on screen. Here is the steps to reproduce this problem.

1. Open cmder window (Command prompt)
   
2. Paste a text on it. For example, http://cmder.net/
   
3. Then press Ctrl+Z undo changes. You'll see "h" remain on window and the "h" can't be deleted unless you clear the screen by "Ctrl+L".
   
4. If you just paste the same text again. The screen will like the following screenshot.
   

[uahim]

hit Ctrl+Z again? :) but seriously, I can confirm this happening in pure cmd.exe, apparently it deletes portions of text rather than the entire pasted/typed string. but maybe it's a feature rather than a bug?

[doggy8088]

@uahim I tried. Hit Ctrl+Z multiple times doesn't solve the problem. Also, the pure cmd.exe doesn't have a "Ctrl+Z" (undo) feature. I don't understand what do you mean about "maybe it's a feature rather than a bug" ?

[doggy8088]

I recorded a short video to show this problem. Please check: https://youtu.be/sQ5ZURcAi5Q

[uahim]

@doggy8088 sorry, I chose my words poorly: by "pure cmd" I meant it also happens in clink+cmd rather than clink+cmder, of course; and in clink+cmd this behavior can be reproduced, but can be worked around with simply repeating the shortcut (which indeed is a little annoying).

with the last sentence I meant maybe it is the way the authoer intended it to be or it may be depending on readline.

[doggy8088]

@uahim I tried to use clink+cmd that is ok. It may not a problem from clink or readline. I'm not sure. Is it possible a Cmder problem?

[doggy8088]

I find out the root cause finally. I think this problem is not related to clink. My workaround was noted here: cmderdev/cmder#623

[uahim]

interesting. as I said I'm not using cmder, but I experience the same behavior. when I paste https://github.com/mridgers/clink/issues/346, I need to hit Ctrl+Z thrice: it first deletes "/346", then "ridgers/clink/issues" and the last time it deletes the rest.

this is reproducable in multiple/new cmd windows.