Steps to reproduce
- Create a new note in an empty vault (restricted mode ON, no community plugins, no CSS snippets, default theme)
- Add approximately 30-40 callout blocks (
> [!quote],> [!tip], etc.) spread across the note, each with bold text inside - Add headings between callouts so the note has ~50 headings and ~40 callouts across ~600-700 lines total
- Open the note in Live Preview mode
- Scroll down to the latter half of the document
- Observe that at some point (approximately after 25-30 callouts), inline formatting breaks:
**bold**markers become visible (not folded/hidden)> [!quote]-shows as raw blockquote text instead of a rendered callout widget
- Switch to Reading View — the entire document renders correctly
- Switch back to Live Preview — the issue persists in the same region
Did you follow the troubleshooting guide? [Y/N]
Yes. Tested with:
- All community plugins disabled
- All CSS snippets disabled
- Default theme
- Restricted mode ON
- Full app restart (Cmd+Q and reopen)
- Issue persists in all conditions above
Expected result
All callout widgets and inline formatting (** marker hiding) should render consistently throughout the entire document in Live Preview, regardless of the number of callouts.
Actual result
After approximately 25-30 callouts have been rendered, Live Preview stops processing:
- Bold markers (
**) remain visible as literal text instead of being hidden - Callout syntax (
> [!quote]-) displays as plain blockquote text instead of callout widget - Heading syntax highlighting continues to work (since it’s CSS-based, not widget-based)
The break point is cumulative — it depends on total callout widgets processed, not viewport position. A 700-line document without callouts renders fine; the same length with 40+ callouts breaks.
Environment
After approximately 25-30 callouts have been rendered, Live Preview stops processing:
- Bold markers (
**) remain visible as literal text instead of being hidden - Callout syntax (
> [!quote]-) displays as plain blockquote text instead of callout widget - Heading syntax highlighting continues to work (since it’s CSS-based, not widget-based)
The break point is cumulative — it depends on total callout widgets processed, not viewport position. A 700-line document without callouts renders fine; the same length with 40+ callouts breaks.
Additional information
Document statistics of the file where the issue was discovered:
| Metric | Value |
|---|---|
| Total lines | 682 |
| Total characters | 22,108 |
| Headings | 51 (H1: 3, H2: 19, H3: 28, H4: 1) |
| Callout blocks | 45 (quote: 35, tip: 6, warning: 2, info: 2) |
| Blockquote lines | 255 |
| Rendering breaks at | ~line 400 (after ~27 callouts) |
The issue appears to be related to CodeMirror 6’s widget rendering budget. Each callout requires a widget DOM element to be created, measured, and tracked. When the cumulative widget count exceeds ~25-30, the rendering pipeline stops processing new widgets and inline formatting decorations for the remaining content.