Hide and Unhide a block of codes (Like folding feature in some editors)

[bh]

@sm2art

hide a block of codes, by logical structures, for example, that if...else block

Yes, this is definitely on our list of things to do When Things Slow Down™. We're thinking mainly about hiding everything under a hat block, so you can tell that the sprite responds to some condition but not know how until you expand that script. But hiding what's inside a C-slot is also part of the plan. No promises about when this will happen, though.

sometimes it's difficult to position the drag and drop into the right empty spot, is there any best practices to make it easier?

Yes, be sure to grab the block(s) you want to move by the top left corner. (I don't mean the exact corner pixel, just near the corner.) That helps a lot. Also sometimes it's best to fill empty slots from right to left; Snap! prefers to drop into an empty slot rather than push something out of a filled slot.

to unringfy an input block in certain situation, you need to position your mouse to the exact oval edge...

What, no, you shouldn't need to do that! Just right-click anywhere in the block body (i.e., not in an input slot).

what's the trick for people to use if they are not using mouse, rather keyboard?

Use the arrow keys to get the focus on the input slot containing the block or script you want to unringify. Then use the space key to open the context menu for that input slot, which should include ringify and unringify options. See page 131 of the manual.

I would like this comment block also foldable, ie, with a click on the edge of the comment block, one can simply hide the majority of the comment lines

Okay, this is one we haven't thought about! But yeah, when we do hiding we should include hiding of multiline inputs.

c-block where you want your code commented out (no actions)

I just use

for that.