carbon-app/carbon

Help wanted: Codemirror sometimes temporarily shows incorrect editors

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#1389 opened on Jun 13, 2022

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bug:needs-reproductiongood first issuehelp wantedmaintenance

Description

In certain conditions, sometimes the editor is displayed incorrectly with this extra padding:

However, it goes away when editing the code, OR even resizing the window. This must be a codemirror bug.

We need to find a work around.

Contributor guide

Tech stack
javascriptreact
Domain
frontend
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
needs investigation
Prerequisites
JavaScriptReactCodeMirror
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the CodeMirror setup in the carbon codebase, specifically in the React component that renders the editor. Check for CSS rules that might cause extra padding. Look at the CodeMirror configuration options like lineWrapping or scrollbar styling. Try to reproduce by toggling window size or editing code. Consider adding a workaround such as calling `refresh()` on the editor instance after a resize. See any comments for additional hints.