completion: install panic handler in completion callback

This callback is actually invoked in a goroutine by time.AfterFunc. The
panic handler must be explicitly installed.

Link: https://github.com/golang/go/blob/go1.18/src/time/sleep.go#L160-L173
Signed-off-by: Robin Jarry <robin@jarry.cc>
Acked-by: Moritz Poldrack <moritz@poldrack.dev>

lib/ui/textinput.go

@@ -9,6 +9,7 @@ import (
 	"github.com/mattn/go-runewidth"
 
 	"git.sr.ht/~rjarry/aerc/config"
+	"git.sr.ht/~rjarry/aerc/logging"
 )
 
 // TODO: Attach history providers
@@ -280,6 +281,7 @@ func (ti *TextInput) updateCompletions() {
 	}
 	if ti.completeDebouncer == nil {
 		ti.completeDebouncer = time.AfterFunc(ti.completeDelay, func() {
+			defer logging.PanicHandler()
 			ti.showCompletions()
 		})
 	} else {