Custom snap areas for BTT V3.202 work perfectly for a long time. After I updated the Mac OS to 10.15, almost all apps can still use custom and standard snap areas except for Devonthink v3.0.
When other windows are dragged, the custom snap areas show up, but when the windows of Devonthink 3.0 are dragged, no snap area is shown. When in Mac OS 10.14.6, Devonthink 3.0 works well with snap areas (custom and the std 4 corners). I checked with the developer of DT3.0 and they told me that the app windows they use are just the normal window class.
Any suggestions will be very helpful. Thank you very much.