RTL (Right-to-left) support is broken on Chrome

[railsbob]

Trix uses Chome's dirname and FormData API to determine text direction and wrap the content in a dir="rtl" element. Chrome recently changed the behaviour, and the dirname on input doesn't set the direction on the containing form. This results in the RTL text to align left. Here's a minimal example that demonstrates the breaking change.

Steps to Reproduce

1. Use Chrome v113.0.5672.92
2. Use any RTL language keyboard (Arabic, for example) and input text in the editor.
3. The text's wrapper div element doesn't have dir="rtl", and the text is aligned left instead of right.

Details

• Trix version: 2.0.4
• Browser name and version: Chrome 113.0.5672.92
• Operating system: macOS 13.2.1