perf(drag-drop): avoid unnecessary change detection on pointer down events (#18821)
perf(drag-drop): avoid unnecessary change detection on pointer down events (#18821)

When the drag&drop was initially implemented it had to trigger change detection immediately once dragging started so that the data bindings get updated correctly. After some time we introduced a threshold for dragging that also triggers its own change detection and makes the initial change detection unnecessary.

Fixes #18726.
mmalerba/material2,crisbeto/material2,crisbeto/material2,josephperrott/material2,DevVersion/material2,mmalerba/material2,mmalerba/material2,andrewseguin/material2,mmalerba/material2,angular/components,mmalerba/material2,crisbeto/material2,DevVersion/material2,Jefiozie/material2,Jefiozie/material2,Jefiozie/material2,DevVersion/material2,josephperrott/material2,andrewseguin/material2,andrewseguin/material2,angular/components,andrewseguin/material2,angular/components,andrewseguin/material2,crisbeto/material2,josephperrott/material2,DevVersion/material2,angular/components,josephperrott/material2,Jefiozie/material2,DevVersion/material2,josephperrott/material2,Jefiozie/material2