3.43.0 theme.mode: dark option overrides chart.background

[cart-before-horse]

theme.mode: "dark" option overrides chart.background: "transparent"

Steps to Reproduce

Create a chart with chart.background: "transparent" and theme.mode: "dark" options

Expected Behavior

chart.background: "transparent" takes precedence over theme.mode: "dark" like any other explicitly defined background color. Looks like dark mode treats background: transparent like background: undefined

Actual Behavior

background is always rgba(0, 0, 0, 0.8)

Screenshots

Reproduction Link

https://codepen.io/cart-before-horse/pen/ExGJjOa

from 9936ffc commit

[cart-before-horse]

can be fixed by setting chart.background to none or rgba(0,0,0,0) instead of transparent but is doesn't feel right, since the color transparent was explicitly set