fix: delete node does not propagate non null selection

[squidrye]

fixes #39

[CLAassistant]

All committers have signed the CLA.

[LucasXu0]

Hey, @squidrye. Not every delete can assign the beforeSelection to the afterSelection. For example,

Before
Node 1
|Node 2| <- delete it. || means the selection

After
Node 1| <- now, the afterSelection is not equal to the beforeSelection

[squidrye]

Thanks for pointing that out, I'll see what can be done.

[squidrye]

I have added a condition to check if node being deleted is currently selected node, if so after-selection will not be updated, but if node being deleted is not selected and some node in background is selected it will be propagated and maintained.

|Node 1|
Node 2 <- deleted then Node 1 will be still selected

|Node 1| <- deleted then afterSelection will not be updated

Let me know if I am missing something else here.

[LucasXu0]

Hey, @squidrye. Please format your code.

[codecov]

Codecov Report

Merging #45 (42ffa09) into main (645e430) will increase coverage by 0.62%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
+ Coverage   82.04%   82.66%   +0.62%     
==========================================
  Files         124      124              
  Lines        7179     7189      +10     
==========================================
+ Hits         5890     5943      +53     
+ Misses       1289     1246      -43     

Impacted Files	Coverage Δ
lib/src/core/transform/transaction.dart	95.87% <100.00%> (+0.10%)	⬆️

... and 4 files with indirect coverage changes

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