Screenshot 'position: fixed' level is not corrent.

[promise96319]

Bug reports:

<div style={{ position: 'relative' }}>
    <div style={{ position: 'fixed', left: 0, top: 0 }} />
</div>

When 'position: fixed' has a parent/grandparent node that has the style 'position: relative', the screenshot's level is not correct.

Because the renderContentStack method render 'position: fixed' after 'position: relative'。But 'position: fixed' should render in the top level, it should be relative to the viewport or 'transform: xxx', not 'position: relative'

Specifications:

• html2canvas version tested with: 1.4.1
• Browser & version: Chrome Version 122.0.6261.69 (Official Build) (x86_64)
• Operating system: macOS Sonoma