[zelos rendering] vertical tight nesting

[samelhusseini]

Is your feature request related to a problem? Please describe.

Similar to how we cut back the implicit padding added by the left and right connection shapes, we need to do the same with the padding added by the top / bottom row in some situations:

Describe the solution you'd like

Use negative spacing on the first and last row spacer.

[samelhusseini]

Done.

[laurensvalk]

I realize this is an older issue, but I'm really curious about the design reason behind this fix.

Until I found this thread, I somehow assumed this was a glitch/bug. It seemed surprising that the block would get vertically smaller when inserting a block, with the whole stack resizing as a result.

Maybe this is less noticeable in Blockly apps that don't use many shadow inputs?

resizeshadow.mp4

Video can be reproduced on the advanced playground with Zelos renderer and theme.