🐞 The text was accidentally hidden

### Description

When the header of a blank line is entered, the rest of the text in the document is hidden.

### To Reproduce

1. The cursor moves to the beginning of a blank line
2. Press the Enter button
3. The rest of the text in the document was accidentally hidden

### Expected Behavior

Don't accidentally hide text

### Version Information

CodeEdit: [V0.1.0]
macOS: [14.5]
Xcode: [15.4]

### Additional Context

_No response_

### Screenshots

_No response_

Start by reproducing the issue in CodeEdit V0.1.0 on macOS 14.5 with the cursor at the beginning of a blank line, then press Enter and observe whether the remaining document text is hidden. Done means inserting a new line no longer hides any existing text.

由索引模型根據 Issue 內容生成。