The current use of TapHandler will leak the click event to the ones beneath them. This can cause, say a username to be clicked on when the user is picking a sticker, leading to an unwanted mention being triggered. MouseArea does not suffer from the same problem as TapHandler, and it is able to handle touch events as well.

Type: fix

Open the sticker picker and click on the area where there is both a sticker and the underlying layer (i.e. the timeline) has a sender username. Verify that the sticker is sent and the user mention is not in the send message box.