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[retro 2026-10-12] Atlas / Datagrid 2 / watch-mode traps that cost fix rounds in all three apps #282

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[retro 2026-10-12] Atlas / Datagrid 2 / watch-mode traps that cost fix rounds in all three apps#282

Description

@MendixMau
MendixMau
opened on Oct 12, 2026

Info for research (no PR requested)

Pattern: the Atlas / Datagrid 2 / watch-mode traps below each cost one or more fix rounds in at least one of three apps. Most are one-line facts a skill could hold.

Evidence (2026-10-12/13)

  • A --watch run that sees an SCSS edit drops deployment/web/dist/pages, so every page returns 404 until restart. Hit in 3 tasks of one app and 2 of another, plus one crash during a base e2e run. Counts: 15 NEEDS_RESTART events across the three lanes' ledger.
  • New calculated attributes added while the app runs read empty until restart (4 attributes blank in one screenshot).
  • Datagrid 2: rows are display: contents, so an outline on a row draws nothing, and scrollIntoView on a row scrolls nothing (hit 3 times in two film takes; paint or scroll the first cell). A listview inside a column shows its own "Load more" and "No items found". Columns whose content walks 2 or more associations write a null attribute reference. A manual column width stored in the model did not change the rendered grid template. Setting a width through ALTER PAGE on an existing column gave CE0463. A right-aligned column aligns only its header unless the value is wrapped in a container. A sort arrow on a right-aligned header lands at the cell's far left.
  • Atlas text inputs are flex items: a width is ignored, even with !important, unless flex: 0 0 auto is set.
  • A dynamic text cannot carry an inline Style (crashes the build); wrap it in a container.
  • A snippet's top-level text has no context object; wrap it in a dataview on the parameter.
  • Trial licence session cap: scripts and retry loops that log in without logging out make later logins hang (HTTP 560). 2 of 3 apps; one incident left 6 shells hung for 3 to 7 hours.
  • Reported by one session, not independently verified here: some Atlas spacing classes render nothing, so a 48px gap came from stacked layout-grid padding plus a spacing class.

What worked: a DOM probe per screenshot (focused element, outline, scroll width, grid template) found most of these in one pass; recording the cause in FINDINGS the same day.

What to research: a "known widget traps" skill, loaded for any page task, keyed by widget; a runner helper that logs out in a finally block; mxcli run --watch either rebuilding dist on SCSS change or warning.

🤖 Generated with Claude Code

Activity

  1. MendixMau
    added a commit that references this issue on Oct 13, 2026

    Lint Batch 3: TXT001 build words, TXT002 non-ISO dates, UI001 widget …

    30c5500

  2. MendixMau commented on Oct 19, 2026

    @MendixMau
    MendixMau
    on Oct 19, 2026
    OwnerAuthor

    Status after 1.0 (v2026.10.19): the Datagrid 2 and Atlas input traps are now lint rule UI001 (#305). Still open: confirming the SCSS and watch-mode facts all sit in a skill.

  3. AlvinnYeo commented on Oct 22, 2026

    @AlvinnYeo
    AlvinnYeo
    on Oct 22, 2026

    One more trap for this list, from a Nova-themed app (Mendix 11.14, Atlas Core 4.5, File Uploader widget 2.5.0):

    The Nova theme's css-mappings.scss sets the file uploader's icon variables to images under /resources/images/:

    --file-icon:          url("/resources/images/IconCmdUpload.svg");
--file-warning-icon:  url("/resources/images/cmdCaution16.svg");
--file-remove-icon:   url("/resources/images/cmdClose12.svg");

    Nothing ships those three files: not Nova's own public/images, not Atlas Core, not the File Uploader .mpk (its assets are named file-icon.svg, remove-icon.svg and so on). The uploader therefore
    renders with blank icon slots, and the browser logs three 404s. No build step, lint or design-audit rung notices,
    because the CSS compiles and the widget renders.

    Fix we used: put SVGs taken from the uploader widget's own assets into the app's
    theme/web/resources/images/ under the three names Nova expects. Overriding the three variables in the app's own
    theme file to point at shipped images works too.

    Two possible toolkit follow-ups, for whoever picks this list up:

    1. A line in the widget-traps skill: "Nova theme: uploader icons 404 unless theme/web/resources/images/ holds
      IconCmdUpload.svg, cmdCaution16.svg and cmdClose12.svg."
    2. More generally, check-design-reaches-app.sh (or the design audit) could resolve every url(/resources/…) in
      the compiled theme CSS against what the app serves and list the ones that 404. That catches this class of
      defect for any theme.
  4. MendixMau
    added a commit that references this issue on Oct 26, 2026

    Bug sweep 2026-10-26: gates, runners, doctor, lint receipt, git hooks…

    a088b4e

  5. MendixMau commented on Oct 26, 2026

    @MendixMau
    MendixMau
    on Oct 26, 2026
    OwnerAuthor

    The last two unpromoted traps landed in #578 (squash a088b4e):

    • snippet top-level text has no context object (learned-page-patterns);
    • Nova points the File Uploader icons at images nothing ships (learned-file-upload-widget).

    The rest was already covered.

    Generated by Claude Code

  6. MendixMau
    closed this as completedon Oct 26, 2026
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