io,widget: [android] improve focus

This patch is intended to fix two issues related to focus and
software-keyboard.

The focus is now reseted if it's lost due to external event,
such as clicking on non-Gio window/activity/fragment.

The software-keyboard will now re-open when clicked, except
if it's ReadOnly.

Fixes: https://todo.sr.ht/~eliasnaur/gio/591

Signed-off-by: inkeliz <inkeliz@inkeliz.com>

io/input/router.go

@@ -567,6 +567,14 @@ func (q *Router) changeState(e event.Event, state inputState, evts []taggedEvent
 			e.event = de
 		}
 	}
+	for i := range evts {
+		e := &evts[i]
+		if fe, ok := e.event.(key.FocusEvent); ok {
+			if !fe.Focus {
+				state.keyState.focus = nil
+			}
+		}
+	}
 	// Initialize the first change to contain the current state
 	// and events that are bound for the current frame.
 	if len(q.changes) == 0 {

widget/editor.go

@@ -289,6 +289,9 @@ func (e *Editor) processPointerEvent(gtx layout.Context, ev event.Event) (Editor
 				Y: int(math.Round(float64(evt.Position.Y))),
 			})
 			gtx.Execute(key.FocusCmd{Tag: e})
+			if !e.ReadOnly {
+				gtx.Execute(key.SoftKeyboardCmd{Show: true})
+			}
 			if e.scroller.State() != gesture.StateFlinging {
 				e.scrollCaret = true
 			}
@@ -395,7 +398,7 @@ func (e *Editor) processKey(gtx layout.Context) (EditorEvent, bool) {
 		case key.FocusEvent:
 			// Reset IME state.
 			e.ime.imeState = imeState{}
-			if ke.Focus {
+			if ke.Focus && !e.ReadOnly {
 				gtx.Execute(key.SoftKeyboardCmd{Show: true})
 			}
 		case key.Event: