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klipper: reduce memory usage when there are many images

Fushan Wen requested to merge work/fuf/memory into master

Reason for the change

Set Image's sourceSize property to reduce memory usage.

Test: Add 3 2048x2048 images, get plasmawindowed's RSS from ps command:

  • Before: before: 246256 after: 389356 diff: 143100
  • After: before: 246400 after: 321944 diff: 75544

Test plan

Calculate the memory usage growth of plasmawindowed

Screenshots or screen recordings

Bugs fixed

BUG: 480127 FIXED-IN: 6.3

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