MacDownApp/macdown

Preview pane flickers when typing/updating

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#1057 opened on Mar 13, 2019

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 (16 comments) (23 reactions) (0 assignees)Objective-C (7,686 stars) (930 forks)batch import
bughelp wanted

Description

Seems that the bug from https://github.com/MacDownApp/macdown/issues/253 has come back in the latest build from master.

I get nasty flickering from the preview pane any time I type a keystroke.

Here's a demo video.

This is on a build of master as of today (March 13, 2019) on Mojave 10.14.3

Contributor guide

Tech stack
objective c
Domain
desktop
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.
1-2 days
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.
clear
Prerequisites
Basic understanding of Objective CFamiliarity with Cocoa UI rendering
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Investigate the preview pane update logic in the MacDown codebase. Look for recent changes that could cause double rendering or event conflicts. Review the fix from issue #253 to understand the original problem. Test typing at various speeds to reproduce the flickering and identify the root cause.