Add a new 'precisePreview' option

[lexiv0re]

An attempt to implement a workaround for fengyuanchen/cropper#969.
A new option is proposed to control the desired behavior. Due to the default value compatible with the existing behavior, it does not introduce any breaking changes.
With this option enabled it applies rounding in the calculation of the preview size and position similar to what being applied during the crop process.
Also, fixes inaccuracy (for images with odd height/width) in source canvas transformations (scale/rotate).

[daiyam]

@lexiv0re Can you resolve the conflicting files because your PR is fixing the issue #551? Thx

[codecov-io]

Codecov Report

Merging #300 (d6da068) into master (de57fa9) will decrease coverage by 0.35%.
The diff coverage is 46.66%.

@@            Coverage Diff             @@
##           master     #300      +/-   ##
==========================================
- Coverage   72.63%   72.27%   -0.36%     
==========================================
  Files           9        9              
  Lines        1535     1544       +9     
==========================================
+ Hits         1115     1116       +1     
- Misses        420      428       +8     

Impacted Files	Coverage Δ
src/js/preview.js	80.59% <42.85%> (-10.79%)	⬇️
src/js/utilities.js	73.94% <100.00%> (ø)

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[lexiv0re]

@daiyam I resolved the conflicts but this PR was there for more than 3 years now w/o any attention. So I'm not sure if it's worth investing more time into adding tests as it looks like it may never be merged.

[daiyam]

@lexiv0re Thank you for the PR and the update :)

[Axel-Jacobsen]

Will some version of a fix like this be merged? It seems like it solves some important bugs (e.g. #551).

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 46.66667% with 8 lines in your changes missing coverage. Please review.

Project coverage is 72.27%. Comparing base (de57fa9) to head (d6da068).
Report is 52 commits behind head on main.

Files with missing lines	Patch %	Lines
src/js/preview.js	42.85%	8 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
- Coverage   72.63%   72.27%   -0.36%     
==========================================
  Files           9        9              
  Lines        1535     1544       +9     
==========================================
+ Hits         1115     1116       +1     
- Misses        420      428       +8     

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[fengyuanchen]

V2 has implemented this feature.