ios: attempt to fix rendering glitch when waking up after sleep

CHANGELOG.md

@@ -5,6 +5,7 @@
 - bug fixes
     - canvas: `onTouch` not triggered on iOS when when `event.force`, `event.altitudeAngle` or `event.azimuthAngle` changes
     - switch: interaction issue when value labels contain icons
+    - ios: attempt to fix rendering glitch when waking up after sleep 
 
 ## 1.18.1
 

src/client/ui/ios.js

@@ -41,6 +41,22 @@ if (iOS && !iOS13) {
 
 }
 
+if (iOS) {
+    // when waking from sleep, iOS may have trouble rendering the session properly
+    // this attempts to force a full redraw by shortly resizing the main container
+    document.onvisibilitychange = ()=>{
+        if (document.visibilityState === 'visible') {
+            var main = DOM.get('osc-panel-container#main')[0]
+            main.style.marginBottom = '1px'
+            main.style.marginRight = '1px'
+            setTimeout(()=>{
+                main.style.marginBottom = ''
+                main.style.marginRight = ''
+            })
+        }
+    }
+}
+
 if (iOS13) document.body.classList.add('iOS13')
 
 module.exports = iOS