Add CheckGroup.Remove (#3323)

Fixes #3124

widget/check_group.go

@@ -1,6 +1,8 @@
 package widget
 
 import (
+	"strings"
+
 	"fyne.io/fyne/v2"
 	"fyne.io/fyne/v2/canvas"
 	"fyne.io/fyne/v2/internal/widget"
@@ -75,6 +77,27 @@ func (r *CheckGroup) Refresh() {
 	r.BaseWidget.Refresh()
 }
 
+// Remove removes the first occurrence of the specified option found from a CheckGroup widget.
+// Return true if an option was removed.
+//
+// Since: 2.3
+func (r *CheckGroup) Remove(option string) bool {
+	for i, o := range r.Options {
+		if strings.EqualFold(option, o) {
+			r.Options = append(r.Options[:i], r.Options[i+1:]...)
+			for j, s := range r.Selected {
+				if strings.EqualFold(option, s) {
+					r.Selected = append(r.Selected[:j], r.Selected[j+1:]...)
+					break
+				}
+			}
+			r.Refresh()
+			return true
+		}
+	}
+	return false
+}
+
 // SetSelected sets the checked options, it can be used to set a default option.
 func (r *CheckGroup) SetSelected(options []string) {
 	//if r.Selected == options {

widget/check_group_test.go

@@ -197,3 +197,25 @@ func TestCheckGroup_ToggleSelectionWithSpaceKey(t *testing.T) {
 	test.Type(canvas.Focused(), " ")
 	assert.Equal(t, []string{"Option B"}, check.Selected, "cannot unselect required check")
 }
+
+func TestCheckGroup_ManipulateOptions(t *testing.T) {
+	check := &widget.CheckGroup{Options: []string{}}
+	assert.Equal(t, 0, len(check.Options))
+
+	check.Append("test1")
+	assert.Equal(t, 1, len(check.Options))
+	check.SetSelected([]string{"test1"})
+	assert.Equal(t, 1, len(check.Selected))
+
+	check.Append("test2")
+	assert.Equal(t, 2, len(check.Options))
+
+	removed := check.Remove("nope")
+	assert.Equal(t, false, removed)
+	assert.Equal(t, 2, len(check.Options))
+
+	removed = check.Remove("test1")
+	assert.Equal(t, true, removed)
+	assert.Equal(t, 1, len(check.Options))
+	assert.Equal(t, 0, len(check.Selected))
+}