https://bugs.kde.org/show_bug.cgi?id=399120

            Bug ID: 399120
           Summary: [Usability] Animation Curves docker has strange layout
                    (negative values, max value (100 or 255) not visible)
                    and is not intuitive
           Product: krita
           Version: 4.1.1
          Platform: Other
                OS: MS Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Usability
          Assignee: krita-bugs-n...@kde.org
          Reporter: tamtamy.tym...@gmail.com
  Target Milestone: ---

Created attachment 115255
  --> https://bugs.kde.org/attachment.cgi?id=115255&action=edit
Krita Animation Curves Docker

SUMMARY
Animation Curves docker on Krita 4.1.1. looks strange and unintuitive. 

- Values on the value axis (Y) are from -250 to 50 (probably; there is no
number); negative values are impossible to set, while positive values can be
set from 0 to 255, as expected and written in Krita Manual
(https://docs.krita.org/fr/reference_manual/dockers/animation_curve.html on
date: 26.09.2018). Also the docker shown in the manual seems to have correct
values on the axes; I don't know, but the docker I see have wrong values (see
attachment). Possible reason: no min and max values set in the widget used to
show curves.

- you can't select another frame by clicking inside the curve box, you need to
click on the number of the frame or on the little rectangle below it; only then
you can add a new frame in that location by clicking on the "Add opacity frame"
icon in the docker

- you can't add a new opacity frame on the docker with the method mentioned
above if the layer doesn't have any opacity frames yet (you need to do it by
clicking "Add opacity frame" in another docker, i.e. Animation Docker)

- the default value of the opacity frame is 0% instead of 100% or the general
opacity of the layer

- it would be nice if there were lines showing the levels of opacity: 25%, 50%,
75%, 100% or even just values 50, 100, 150, 200, 255 - now it's hard to
maintain the same level for different key frames (it's hard to set 100% of
opacity, too)



STEPS TO REPRODUCE
1. Create a new document.
2. In Animation docker, add a new opacity frame on current layer.
3. In Animation Curves docker, observe the values on axis Y.
4. Try to select another frame by clicking inside the curve rectangle.
5. Add a new opacity frame.
6. Set the new opacity frame to 100% of opacity (value 255).



OBSERVED RESULT
As described in Summary

EXPECTED RESULT
As described in Summary

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