The text BoundingBox calculate is wrong of character 'j'

[jtabibito]

Describe the bug
I used same way to calculate characters' boundingbox，and ‘j' is not right if use italic style. And using following code works well.
`

Math.abs(textMetrics.actualBoundingBoxRight) + Math.abs(textMetrics.actualBoundingBoxLeft);

`
The last line of text in the screenshot looks correct.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.