In the integrated Slidev editor, when working on a right-to-left (RTL) document, pressing `Ctrl` + `Left Shift` (Windows RTL/LTR keyboard shortcut) does **not** correctly switch the paragraph / typing direction to left-to-right (LTR).

[geraw]

Describe the bug

In the integrated Slidev editor, when working on a right-to-left (RTL) document, pressing Ctrl + Left Shift (Windows RTL/LTR keyboard shortcut) does not correctly switch the paragraph / typing direction to left-to-right (LTR).

• The editor seems to switch to LTR mode (caret movement / typing direction change),

• but the text itself is not displayed properly:

  • characters appear in the wrong visual order, or
  • mixed Hebrew/English text is rendered with broken bidi layout, or
  • the caret position does not match the visual position of the characters.

This happens only in the integrated editor when the document is configured as RTL (e.g. htmlAttrs: { dir: rtl }). It makes it very hard to edit LTR text (code, formulas, English phrases) inside an RTL presentation.

Expected behavior

When pressing Ctrl + Left Shift in an RTL document:

• The editor should properly switch the current line/paragraph to LTR mode.
• Text should be rendered with correct LTR visual order.
• Caret movement and selection should match the displayed text.

In short, the integrated editor should respect OS bidi / direction shortcuts and render the text accordingly.

---

Minimal reproduction

1. Create a new Slidev project (e.g. npm create slidev@latest or https://sli.dev/new).

2. In slides.md (or the first slide), set RTL, for example:

   ---
   htmlAttrs:
     dir: rtl
     lang: he
   ---
   

3. Open the integrated Slidev editor.

4. On a line with Hebrew text, press Ctrl + Left Shift to switch to LTR.

5. Start typing English text (or a mix of Hebrew and English).

6. Observe that:

   • The editor claims to be LTR, but
   • the text rendering / character order / caret position is incorrect.

---

Environment

• Slidev version: v52.4.0
• Browser: Chrome
• OS: Windows 10 (Hebrew layout)
• Editing context: Integrated editor (not an external editor like VS Code)

[CodyBrat]

Hi, I want to help fix the RTL/LTR issue in the integrated Slidev editor. In RTL mode, pressing Ctrl + Left Shift switches to LTR, but the text order and caret position are still wrong. Can you please assign me this issue @geraw @kermanx

[CodyBrat]

i have raised a pr on the issue please do have a look @geraw @kermanx