Some mutable cleanups

[soywiz]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 47.20% and project coverage change: -0.03 ⚠️

Comparison is base (ef07581) 51.58% compared to head (9120c33) 51.55%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1477      +/-   ##
==========================================
- Coverage   51.58%   51.55%   -0.03%     
==========================================
  Files        1681     1681              
  Lines       98902    98919      +17     
  Branches    13950    13948       -2     
==========================================
- Hits        51017    50999      -18     
- Misses      44024    44051      +27     
- Partials     3861     3869       +8     

Flag	Coverage Δ
unittests	51.55% <47.20%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...in/kotlin/korlibs/korge/view/NinePatchShapeView.kt	0.00% <0.00%> (ø)
...ommonMain/kotlin/korlibs/korge/view/VectorImage.kt	0.00% <0.00%> (ø)
...rc/commonMain/kotlin/korlibs/graphics/AGObjects.kt	74.64% <0.00%> (ø)
...ain/kotlin/korlibs/render/awt/BaseAwtGameWindow.kt	0.00% <0.00%> (ø)
...vmMain/kotlin/korlibs/render/osx/MacosGLContext.kt	0.00% <0.00%> (ø)
...otlin/korlibs/render/platform/BaseOpenglContext.kt	0.00% <0.00%> (ø)
...commonMain/kotlin/korlibs/image/bitmap/Bitmap32.kt	56.65% <ø> (+0.16%)	⬆️
...monMain/kotlin/korlibs/image/bitmap/BitmapSlice.kt	62.26% <0.00%> (ø)
...onMain/kotlin/korlibs/image/vector/BitmapVector.kt	0.00% <0.00%> (ø)
...rim/src/jvmMain/kotlin/korlibs/image/awt/AwtExt.kt	44.44% <0.00%> (+3.41%)	⬆️
... and 26 more

... and 24 files with indirect coverage changes

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