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Add support for scaling the Markdown preview's body text and headings with `cmd-=` / `cmd--` / `cmd-0`. Previously these shortcuts only resized code blocks because the preview's body used `ui_font_size` and headings used a rem-based scale anchored to it, while the keybindings only mutated `BufferFontSize`. The preview's scroll subtree is now wrapped in `WithRemSize(buffer_font_size)`, so `1rem` resolves to the buffer font size inside the preview. Body text, headings (`text_3xl`/`text_2xl`/...), and rem-based spacing all scale together. The outer focus root and scrollbar remain at the UI font size. Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and reliability - [x] Unsafe blocks (if any) have justifying comments - [x] The content is consistent with the [UI/UX checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable Closes #55374 Release Notes: - Added `markdown_preview_font_size` setting and actions to scale Markdown preview font size separately from the editor. --------- Co-authored-by: Smit Barmase <heysmitbarmase@gmail.com> |
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