[krita] [Bug 471543] New: Memory leak when sampling a hidden, color-labeled filter layer

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https://bugs.kde.org/show_bug.cgi?id=471543

            Bug ID: 471543
           Summary: Memory leak when sampling a hidden, color-labeled
                    filter layer
    Classification: Applications
           Product: krita
           Version: 5.1.5
          Platform: Homebrew (macOS)
                OS: macOS
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Filter Layers
          Assignee: krita-bugs-null at kde.org
          Reporter: code at thecodewarrior.dev
  Target Milestone: ---

SUMMARY
When a tool samples a hidden, color-labeled filter layer Krita starts leaking
significant amounts of memory.

STEPS TO REPRODUCE
1. Open a large image (width/height of a few thousand pixels)
2. Create the following layer structure:
  - Filter layer (Color Adjustment Curves, hidden, labeled red)
  - Background (labeled red)
  - Empty layer
3. Set the fill tool to sample the red layers
4. Select the empty layer and start spamming the fill tool

OBSERVED RESULT
After spamming the fill tool a couple dozen times, the memory usage will spike
by multiple gigabytes, and that memory won't be freed even if you close the
image and open a different one. The memory doesn't seem to be categorized
anywhere in the memory indicator, showing up in the total memory used, but not
in any of the categories.

EXPECTED RESULT
The memory usage should stay relatively constant

SOFTWARE/OS VERSIONS
macOS Ventura (13.2)

ADDITIONAL INFORMATION
- The same issue occurs with the Fill Tool, Contiguous Selection Tool, or
Similar Color Selection Tool
- The issue occurs with any filter I tested (Color Adjustment Curves, Levels,
Blur)
- The issue doesn't occur when the filter layer is visible
- Setting the filter layer to visible and using the fill tool again doesn't
clear the leaked memory
- The issue doesn't occur when the filter layer is hidden and the fill tool is
set to sample the merged image

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