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Previous output leeches through to nvim w/ WebGL Addon enabled

See original GitHub issue

Previous commands’ output leeches through to nvim. The old output is only visible on the same lines you see the nvim prompt text - see screenshot. Doesn’t happen with other editors, tried vi, nano, micro. Only happens when using the WebGL Addon.

Details

Browser and browser version: Firefox 101.0.1
OS version: Linux 5.15.49-1-MANJARO
xterm.js version: latest

Steps to reproduce

Run some commands until at least half of your screen is filled with output bottom to top
Run nvim

Issue Analytics

State:
Created a year ago
Comments:14 (8 by maintainers)

Top GitHub Comments

1reaction

JasonXJcommented, Sep 5, 2022

So, there are actually two different bugs mentioned here: 1) the issue mentioned by OP and this comment, where some texts are not cleared correctly and 2) Rendering artefects (e.g. dots) on the cursor canvas.

I figured out what is wrong with 1. It can happen when neovim sets some colors and then deletes some characters, and this is what happens inside the WebglRenderer:

setColors() is called, and it clears this._model but not this._glyphRenderer.
_updateModel() is called to update this._model to match the terminal buffer. Because this._model was cleared earlier, the code here thinks that the cell is up-to-date and there is no need to update this._glyphRenderer.

I think the correct fix for this is to make sure we clear this._glyphRenderer when we clear this._model. I will send a pull request soon.

0reactions

Tyriarcommented, Sep 22, 2022

@deadb0d4 I think this was landing in 1.72 (early October)

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