ChatControlBase: Rework drag and drop

3 jobs for drag-drop-file-message-input in 3 minutes and 16 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #14753
run-appdata

00:00:09

passed #14752
run-tests

00:02:54

 
  Build
passed #14754
run-build

00:00:12