Attempt to make modifier key changes take affect when the dialogue closes. This means you don't have to restart Fenrir to apply them.

internal/app/app_test.go

@@ -475,12 +475,13 @@ func (f *fakeSource) Read() (screen.Snapshot, error) {
 }
 
 type fakeKeys struct {
-	poll           func(bool, func(input.Decision)) error
-	closed, passed bool
-	events         chan error
-	captures       []bool
-	captureErr     error
-	onCapture      func(bool)
+	updateModifiers func([]string, []string) (bool, error)
+	poll            func(bool, func(input.Decision)) error
+	closed, passed  bool
+	events          chan error
+	captures        []bool
+	captureErr      error
+	onCapture       func(bool)
 }
 
 func (f *fakeKeys) Events() <-chan error { return f.events }
@@ -496,6 +497,12 @@ func (f *fakeKeys) Capture(enabled bool) error {
 	}
 	return f.captureErr
 }
+func (f *fakeKeys) Update_modifiers(reader, script []string) (bool, error) {
+	if f.updateModifiers != nil {
+		return f.updateModifiers(reader, script)
+	}
+	return true, nil
+}
 func (f *fakeKeys) Pass_next()   { f.passed = true }
 func (f *fakeKeys) Close() error { f.closed = true; return nil }