[krita] [Bug 445617] New: Gradient: Mesh Gradient is not responding at first time invocation

[Hoang Duy Tran]

https://bugs.kde.org/show_bug.cgi?id=445617

            Bug ID: 445617
           Summary: Gradient: Mesh Gradient is not responding at first
                    time invocation
           Product: krita
           Version: 5.0.0-beta1
          Platform: macOS (DMG)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Tools/Vector
          Assignee: krita-bugs-null at kde.org
          Reporter: hoangduytran1960 at gmail.com
  Target Milestone: ---

SUMMARY
When invoke the first time, the Mesh Gradient option doesn't show any changes
on the canvas


STEPS TO REPRODUCE
1. Start Krita, use any default setting for new image
2. Delete the current paint layer, add a vector layer
3. Select the rectangle tool, make sure the options are 
- Fill: Background color
- Outline: No Outline
4. Choose a none black/white background color
5. Draw a rectangle, it should be filled with the chosen background color
6. Use select tool and select the shape.
7. In the Tool Options, select the 'Fill' option (third on the right), the text
you can see is 'Solid'
8. Select the 4th Option (Mesh Gradient icon), the 4th option, next to the text
'Solid'
9. Nothing appeared to have happened on the canvas.
10. Now change to 'Solid' (second icon) again, then back to 4th option 'Mesh
Gradient' (second invocation), now you can see changes on the canvas.

OBSERVED RESULT
At the first time invocation, the canvas remains at the state before, as if
nothing is happening. I'm not saying the code underneath doesn't performing
anything, but going on the changes on the canvas, it appears as if NOTHING is
being done. However, on subsequent invocations, the display of changes is
instant, showing that the code performed the action as required. Maybe at the
first invocation, the screen is NOT REFRESHED as expected.

EXPECTED RESULT
As soon as the option 'Mesh Gradient' is chosen, the transform will be
reflected on the canvas immediately

SOFTWARE/OS VERSIONS
macOS: 10.17.5


ADDITIONAL INFORMATION
Please see testing steps from this screencast
(https://drive.google.com/file/d/1bxlvFSlbxkFiTT60_UvymetmUhkiBRmy/view?usp=sharing)

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