Can you provide a screenshot showing these margins in order to confirm that we speak for the same thing?

Created attachment 117042 [details]
margin of icons in dock

I provide a screenshot of what I mean with pleasure! On the left and right side of the icons there is a margin. But I would find it more elegant if the margin on the right side was bigger. So that the margins would have the same side. 
It would be great if this would be configurable in my opinion. If the icons had to be a little smaller because of the margins I would have no problem with that. B.t.w. I didn't shrink the margins as much as possible in this screenshot.

> It would be great if this would be configurable in my opinion.

I will have to play with it in order to see how it could be configured. The first goal of having symmetrical thick margins makes sense when the background size is at 100%

Created attachment 117231 [details]
Margin for active line

I've added a sceenshot as well, it's more obvious with the desktop pager and the clock.  

I think it may be a good idea to have an option to have the active line be drawn over the applets/icons instead.  I'd rather have no margins at all for my setup.

You can draw the active line over the applets,

1. Appearance, Active Indicator, Reverse
2. Appearance, Active Indicator, All

3. For no margins, Tweaks, Shrink thickness margins to minimum

3. For no margins, Tweaks, Shrink thickness margins to minimum

fixed with latest design, when the user chooses background size 100% then thickness margins are fully symmetrical

Oh, great! I always thought Plasma was brilliant but Latte even makes it better. Thank you!

When using the "plasma layout" (horizontal panel, bottom screen), altering both the internel- and external margins give the same effect I think. Both make the items move closer to each other or further from each other. That is what I think now I'm testing. Changing external margins can not be done as far as I see.

(In reply to PK from comment #10)
> When using the "plasma layout" (horizontal panel, bottom screen), altering
> both the internel- and exte...

you mean Plasma Style indicator?

Created attachment 118318 [details]
horizontal panel bottom screen

I give my latte layout in an attachment. It is called plasma.layout.latte. I can't manage to change the external margins of this layout I think, with the latest latte build.

(In reply to PK from comment #12)
> Created attachment 118318 [details]
> horizontal panel bottom screen
> 
> I give my latte layout in an attachment. It is called plasma.layout.latte. I
> can't manage to change the external margins of this layout I think, with the
> latest latte build.

it works fine for me, if you mean to change the external margins from plasma taskmanager tasks, this is not possible

Created attachment 118319 [details]
externel margin to zero %

I also attach what happens when I set the external margin to 25%

Created attachment 118320 [details]
external margin to 25%

The distance between the items (starter icons) of in the latte panel got wider. I would imagine that the distance between the outer borders of the latte panel and the items in it would change when I change the "external margin" (0 % to 25%). But that didn't happen. I hope I make myself clearer now.

(In reply to PK from comment #15)
> Created attachment 118320 [details]
> external margin to 25%
> 
> The distance between the items (starter icons) of in the latte panel got
> wider. I would imagine that the distance between the outer borders of the
> latte panel and the items in it would change when I change the "external
> margin" (0 % to 25%). But that didn't happen. I hope I make myself clearer
> now.

they do in my system.

1. Please open a new bug report to track this down and answer there the following,
2. If you set them to 0% dont they become narrower?
3. maybe you dont have enough size in your screen?
4. Add a new dock play with it and try to identify when this occurs in order to report back your findings