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[BUG]: `scattergl` text is hidden behind selected markers

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难度
4/5
预计耗时
3-5 天
新手友好度
48/100
Issue 类型
缺陷
描述清晰度
基本清楚
活跃度
活跃
技术栈
javascript

调研方向

Start with the linked CodePen reproduction and compare the scattergl behavior with the equivalent scatter trace. Trace scattergl text rendering around the vendor line using ctx2.getImageData mentioned in the report, and review issue #7285 for context. Done means selected text is visible like unselected text, with the reported canvas warning addressed or its scope clarified.

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描述

bug
Description

scattergl text is hidden behind selected markers

The equivalent scatter trace renders the text correctly.

Reproducible example:

https://codepen.io/Lexachoc/pen/dPvRydx

    mode: "markers+text",
    texttemplate: "x=%{x}",
    selectedpoints: [0],
    selected: {
      textfont: { color: "red" }
    },
    unselected: {
      textfont: {color: 'white'}
    },
Image

For unselect.textfont, both works, only select.textfont is broken for scattergl:

Image
Note

To confirm, uncomment

textposition: 'top-center',
Image

Additional warning observed

When using:

 mode: "markers+text",

or

 mode: "text",

scattergl will throw this warning:

Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently

caused by this line: var bottomPx = firstTop(ctx2.getImageData(0, 0, l2, l2)); from the vendor package.

Reported before in https://github.com/plotly/plotly.js/issues/7285

主要语言
JavaScript
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环境准备

从这里开始

  1. 先读完整个 Issue,再读项目的贡献指南。
  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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