rich text support for hover and leave events tag (cocos#10802)

Prevent errors from being reported when comp.node is missing (cocos#1…

…0540)

add opacity changed event (cocos#10568)

* add opacity changed event

* reset flag

Sync branch v2.4.7 to v2.4.8

Create tag '3d-v3.4.2'

Smooth Motion Streak movement (cocos#9693)

Create tag '3d-v3.4.1'

supports clicking even if the node size is negative (cocos#9925)

Create tag '3d-v3.4.0'

Merge pull request cocos#9740 from knoxHuang/v2.4.6-video

Merge commit 2.4.8