Issue with the opacity option in the Visual Style Editor

[ElenaGallo]

Icon opacity set to 0.00 is actually like 1.00

How to Reproduce

• open this map
• select Unesco Items leyer
• open the layer settings and select the style tab
• select prova style
• click on edit
• Change the opacity to 0.00

Expected Result The opacity set to 0.00 is actually 0.00

Current Result The opacity set to 0.00 is like 1.00

[MV88]

this requires some fix to geostyler-sld-parser

i spoke with @allyoucanmap

• since they use typescript opacity should be a number, so casting it to "0" is a workaround
• push the fix to our forked version
• the fix should include also this
• to a branch which starts from tag 2.0.1
• and then use tarball instead of direct version
• we test it
• then we should propose a PR to their repo

plus

• we then publish it in our scope @geosolutions
• we test the fix and the usage of visual style editor also for master branch (that needs to be updated)

@alexander-fedorenko until the plus you can work