3.x: Fix Observable.window (size, skip, overlap) dispose behavior

[akarnokd]

Disposing the main output of the Observable.window operator did not properly propagate the dispose call under certain circumstances, such as no current active window or the window(s) were abandoned immediately.

Fixes #7048

[codecov]

Codecov Report

Merging #7049 into 3.x will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.x    #7049      +/-   ##
============================================
- Coverage     99.52%   99.51%   -0.02%     
+ Complexity     6669     6667       -2     
============================================
  Files           742      742              
  Lines         47273    47275       +2     
  Branches       6374     6374              
============================================
- Hits          47048    47045       -3     
- Misses          105      107       +2     
- Partials        120      123       +3     

Impacted Files	Coverage Δ	Complexity Δ
...nternal/operators/observable/ObservableWindow.java	100.00% <100.00%> (ø)	3.00 <0.00> (ø)
.../internal/disposables/ListCompositeDisposable.java	98.00% <0.00%> (-2.00%)	34.00% <0.00%> (-1.00%)
...tivex/rxjava3/disposables/CompositeDisposable.java	98.14% <0.00%> (-1.86%)	39.00% <0.00%> (-1.00%)
...ternal/operators/observable/ObservablePublish.java	97.29% <0.00%> (-1.81%)	16.00% <0.00%> (-1.00%)
...a3/internal/operators/flowable/FlowableCreate.java	97.08% <0.00%> (-1.62%)	6.00% <0.00%> (ø%)
...ternal/operators/completable/CompletableMerge.java	97.29% <0.00%> (-1.36%)	2.00% <0.00%> (ø%)
...ternal/operators/observable/ObservableGroupBy.java	98.90% <0.00%> (-1.10%)	2.00% <0.00%> (ø%)
...operators/observable/ObservableMergeWithMaybe.java	99.09% <0.00%> (-0.91%)	2.00% <0.00%> (ø%)
...nternal/operators/observable/ObservableCreate.java	99.14% <0.00%> (-0.86%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableCombineLatest.java	99.38% <0.00%> (-0.62%)	6.00% <0.00%> (ø%)
... and 6 more

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[vanniktech]

Whops. Somehow missed this 👍