5291 imagery view does not discard old images when they fall out of bounds

[scottbell]

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[codecov]

Codecov Report

Merging #5346 (d179595) into master (84f1a61) will increase coverage by 0.05%.
The diff coverage is 39.13%.

@@            Coverage Diff             @@
##           master    #5346      +/-   ##
==========================================
+ Coverage   49.48%   49.54%   +0.05%     
==========================================
  Files         589      589              
  Lines       21563    21553      -10     
  Branches     2020     2020              
==========================================
+ Hits        10671    10678       +7     
+ Misses      10350    10332      -18     
- Partials      542      543       +1     

Impacted Files	Coverage Δ
example/imagery/plugin.js	5.66% <0.00%> (-0.34%)	⬇️
src/plugins/imagery/mixins/imageryData.js	77.02% <50.00%> (+4.61%)	⬆️
...c/plugins/persistence/couch/CouchObjectProvider.js	80.78% <0.00%> (-1.18%)	⬇️
...ettingsSynchronizer/URLTimeSettingsSynchronizer.js	97.97% <0.00%> (+1.01%)	⬆️
src/ui/router/Browse.js	90.41% <0.00%> (+1.36%)	⬆️
src/plugins/tabs/components/tabs.vue	36.00% <0.00%> (+1.60%)	⬆️
src/plugins/imagery/components/ImageryTimeView.vue	78.16% <0.00%> (+6.89%)	⬆️

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