Fix onKeyDown events return value over some UI components.

src/eepp/ui/uicheckbox.cpp

@@ -289,18 +289,20 @@ bool UICheckBox::applyProperty( const StyleSheetProperty& attribute ) {
 	return true;
 }
 
-Uint32 UICheckBox::onKeyDown( const KeyEvent& Event ) {
-	UITextView::onKeyDown( Event );
+Uint32 UICheckBox::onKeyDown( const KeyEvent& event ) {
+	UITextView::onKeyDown( event );
 
-	if ( Event.getKeyCode() == KEY_SPACE ) {
+	if ( event.getKeyCode() == KEY_SPACE ) {
 		if ( Sys::getTicks() - mLastTick > 250 ) {
 			mLastTick = Sys::getTicks();
 
 			setChecked( !mChecked );
+
+			return 1;
 		}
 	}
 
-	return 1;
+	return UITextView::onKeyDown( event );
 }
 
 void UICheckBox::onAlphaChange() {

src/eepp/ui/uilistbox.cpp

@@ -890,7 +890,7 @@ void UIListBox::selectNext() {
 }
 
 Uint32 UIListBox::onKeyDown( const KeyEvent& event ) {
-	UINode::onKeyDown( event );
+	Uint32 ret = UINode::onKeyDown( event );
 
 	if ( mFlags & UI_MULTI_SELECT )
 		return 0;
@@ -961,7 +961,7 @@ Uint32 UIListBox::onKeyDown( const KeyEvent& event ) {
 
 	itemKeyEvent( event );
 
-	return 1;
+	return ret;
 }
 
 Uint32 UIListBox::onMessage( const NodeMessage* Msg ) {

src/eepp/ui/uitextview.cpp

@@ -990,7 +990,7 @@ Uint32 UIAnchor::onKeyDown( const KeyEvent& event ) {
 		}
 	}
 
-	return 0;
+	return UIWidget::onKeyDown( event );
 }
 
 std::string UIAnchor::getPropertyString( const PropertyDefinition* propertyDef,

src/eepp/ui/uiwindow.cpp

@@ -1783,7 +1783,7 @@ Uint32 UIWindow::onKeyDown( const KeyEvent& event ) {
 	std::string cmd = mKeyBindings.getCommandFromKeyBind( { event.getKeyCode(), event.getMod() } );
 	if ( !cmd.empty() ) {
 		executeKeyBindingCommand( cmd );
-		return 0;
+		return 1;
 	}
 	return UIWidget::onKeyDown( event );
 }