Add strict equalities in src/display/api.js
Add strict equalities in src/display/canvas.js
Add strict equalities in src/display/metadata.js
Add strict equalities in src/display/pattern_helper.js
Add strict equalities in src/display/svg.js
Merge pull request #5113 from Snuffleupagus/strict-equalities-src-display

Add strict equalities in src/display/*