Merge branch 'master' into async_handlers

src/browser/Terminal.ts

@@ -386,7 +386,7 @@ export class Terminal extends CoreTerminal implements ITerminal {
       throw new Error('Terminal requires a parent element.');
     }
 
-    if (!document.body.contains(parent)) {
+    if (!parent.isConnected) {
       this._logService.debug('Terminal.open was called on an element that was not attached to the DOM');
     }
 

src/browser/services/RenderService.ts

@@ -174,6 +174,10 @@ export class RenderService extends Disposable implements IRenderService {
   }
 
   public onDevicePixelRatioChange(): void {
+    // Force char size measurement as DomMeasureStrategy(getBoundingClientRect) is not stable
+    // when devicePixelRatio changes
+    this._charSizeService.measure();
+
     this._renderer.onDevicePixelRatioChange();
     this.refreshRows(0, this._rowCount - 1);
   }