add GlobalEvent for monitor visibilitychange/devicePixelRatio change

[deyihu]

fix #2152

[codecov-commenter]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (2c16dd3) 83.60% compared to head (df0c3ce) 83.64%.

Files	Patch %	Lines
src/core/GlobalEvent.js	77.41%	7 Missing ⚠️
src/renderer/map/MapRenderer.js	14.28%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2155      +/-   ##
==========================================
+ Coverage   83.60%   83.64%   +0.04%     
==========================================
  Files         167      168       +1     
  Lines       18685    18691       +6     
==========================================
+ Hits        15621    15634      +13     
+ Misses       3064     3057       -7     

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