vispy / vispy / 19731777862

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Add parameter to control line height in text visual (#2711)

Small addition that allows to set the line height in the text visual.

```py
from vispy import scene
from vispy.scene.visuals import Text

# Create canvas with a viewbox at the lower half
canvas = scene.SceneCanvas(keys='interactive')

t1 = Text('Line height\nis default 1.5', parent=canvas.scene, color='red', font_size=20, line_height=1.5)
t2 = Text('Line height\nlowered to 1', parent=canvas.scene, color='blue', font_size=20, line_height=1)
t3 = Text('Line height\nincreased to 2', parent=canvas.scene, color='magenta', font_size=20, line_height=2)

t1.pos = canvas.size[0] // 2, (canvas.size[1] // 4) * 1
t2.pos = canvas.size[0] // 2, (canvas.size[1] // 4) * 2
t3.pos = canvas.size[0] // 2, (canvas.size[1] // 4) * 3

if __name__ == '__main__':
    canvas.show()
    canvas.app.run()
```

<img width="802" height="602" alt="image"
src="https://github.com/user-attachments/assets/939fa8e4-1062-4cde-b588-ba1c7a61b310"
/>

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