[bug] region color styling broken in v3.10

[ebencollins]

Description

Regions created with "class" property no longer have their fill color since v3.10.

This seems to have happened in 0496ec6.

Expected (v3.9.4)

Actual (v3.10.3)

Steps to check or reproduce

1. Add regions with class
2. Specify style with fill color for class
3. Observe region is still of default color

v3.10.3 (broken): https://stackblitz.com/edit/nisjec-buk5d2?file=index.ts
v3.9.4 (working): https://stackblitz.com/edit/nisjec-j5fxtt?file=index.ts

[netil]

hi @ebencollins, thanks for the report.
It a side-effect of #3323, which updated region's rect element default css rule.

[netil]

@ebencollins for workaround w/o library udpate, specify rect in each selector to increase the specifity.
(this will work after the fix also)

  #styleForRegion .bb-region-0 rect {
    fill: red;
  }
  #styleForRegion .bb-region.foo rect {
    fill: green;
  }