Add Frame::{set_,}{up,down}scale_filter()

[YaLTeR]

Allows changing the filter on the fly, especially useful within RenderElements::draw() where the renderer is inaccessible.

Example use: YaLTeR/niri#189

[codecov-commenter]

Codecov Report

Attention: 8 lines in your changes are missing coverage. Please review.

Comparison is base (91e61f1) 21.32% compared to head (0c06b78) 21.31%.

Files	Patch %	Lines
src/backend/renderer/test.rs	0.00%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1329      +/-   ##
==========================================
- Coverage   21.32%   21.31%   -0.01%     
==========================================
  Files         156      156              
  Lines       25121    25129       +8     
==========================================
  Hits         5356     5356              
- Misses      19765    19773       +8     

Flag	Coverage Δ
wlcs-buffer	18.41% <0.00%> (-0.01%)	⬇️
wlcs-core	18.09% <0.00%> (-0.01%)	⬇️
wlcs-output	7.75% <0.00%> (-0.01%)	⬇️
wlcs-pointer-input	20.12% <0.00%> (-0.06%)	⬇️

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[Drakulix]

I wonder if this blurs the lines in terms of expectations of what state is local to a Frame.

Maybe this should be reset on dropping the Frame?

[SergioRibera]

Any update?