[Bug]: HTML node is always on top even with lower zIndex #6974

Describe the bug / 问题描述

Description:

HTML type node are always rendered on top. Even after setting zIndex of edge to 99, it does not come on top of html node. Same happens with shadow element when dragging. Setting shadowZIndex to 99 does not have any effect.

Only happens when using canvas as renderer

Reproduction link / 复现链接

No response

Steps to Reproduce the Bug or Issue / 重现步骤

1. Create a graph with html node
2. Add drag-element behavior and set shadow to true
3. Notice shadow is behind the HTML node, which does not change even after setting its zIndex

Same for edge overlap: Make edge overlapping the source and target by setting startArrowOffset and endArrowOffset. No matter what zIndex you set, edges are always behind HTML node.

Version / 版本

🆕 5.x

OS / 操作系统

• macOS
• Windows
• Linux
• Others / 其他

Browser / 浏览器

• Chrome
• Edge
• Firefox
• Safari (Limited support / 有限支持)
• IE (Nonsupport / 不支持)
• Others / 其他