https://bugs.kde.org/show_bug.cgi?id=396576

            Bug ID: 396576
           Summary: Re-implementing the old behavior of Isolate Layer used
                    on Group Layers
           Product: krita
           Version: 4.1.0 beta
          Platform: MS Windows
                OS: MS Windows
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: Layer Stack
          Assignee: krita-bugs-n...@kde.org
          Reporter: micho...@gmail.com
  Target Milestone: ---

Hello. I would like to make a suggestion that a function, which used to be
available as standard in past versions of Krita, be brought back as a new
separate option or setting. 
I'm referring to the way Isolate Layers function works on group layers. In the
past, using "Isolate Layer" option on some specific layer would apply it to
only this specific layer, and the function would be turned off if you tried to
select any other layer. Currently, the option is "global", in that you can
freely switch between layers, and whichever layer you currently have selected
becomes isolated. That is fine, however, it has an unfortunate side effect when
it comes to group layers. In the past, selecting a group layer allowed you to
switch between all the child layers, while still seeing the entire group. Right
now, selecting either of the child layers will make the layer isolation
"switch" to only encompass the newly chosen layer.

To give a clearer, step by step comparison:

Suppose I have a Group Layer containing paint layers A, B and C inside of it,
as well as multiple ungrouped layers.

Behavior of the Isolate Layer function in Krita 3.0 and older:
-I right click on the Group Layer and select the "Isolate Layer" option
--All layers outside of the Group Layer become hidden, while layers A B and C
remain visible
-I click on layer A to begin editing it
--All the layers retain their visibility. A, B and C are all still visible
while I edit layer A
-I click on layer B to begin editing it
--All the layers retain their visibility. A, B and C are all still visible
while I edit layer B
-I click on any layer outside of the group OR I create a new layer within the
group
--The "Isolate Layer" option is disabled. All layers become visible again.

Behavior of the Isolate Layer function in the current version of Krita:
-I right click on the Group Layer and select the "Isolate Layer" option
--All layers outside of the Group Layer become hidden, while layers A B and C
remain visible
-I click on layer A to begin editing it
--Layers B and C become hidden, as Isolate Layer only focuses on currently
selected layer
-I click on layer B to begin editing it
--Layers A and C become hidden...
-I click on any layer outside of the group
--The selected outside layer becomes visible, while A, B and C are all hidden.
-I try to create a new layer
--The "Isolate Layer" option is disabled, All layers become visible again

While the current form of Isolating Layers makes it easier to view many
different layers individually in quick succession (something which was already
possible, just less convenient), it severely limits the potential of this
function. I, personally, found the old form of it really useful in my workflow.
For example, images I work on frequently feature multiple independently lined,
shaded and textured items, each contained in a separate group, and often
overlapping. Being able to work on each object separately, without having to
manually hide all other objects manually was incredibly handy. 
It is even more useful in situations where the layer group uses some specific
opacity or blending mode (acting as a filter or a texture) - in the current
version, to see and edit the "raw" version of the group one does not only have
to disable all other layers by hand, but also needs to reset the blending mode
and opacity settings for the duration of the edits, and then put them back
after they're done (hoping, that they haven't forgotten the exact values). That
is really tedious compared to the convenience of the old mode of operation. 
Worth noting, that the old way also worked for paint/vector layers with masks
attached to them.

My suggestion would be adding a toggle/setting in the View menu or Configure
Krita panel that lets you decide whether you want layer isolation to "foolow
you around" or stick to the originlly isolated layer. 
Alternatively, it could be a whole other option only applicable to group
layers/layers with masks - when right clicking on a any layer with children,
the menu would feature separate "isolate layer" and "isolate group" items. 

In either case, it would be quite beneficial to, in some way, reimplement this
old functionality.

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