Don't destroy the new command being entered in ConsoleView

Not a perfect solution as it doesn't remember the modifications
made to previous commands, but it's more common to be concerned
about the command being entered than about the changes made to
the previous commands.

src/gui/console/ConsoleView.cpp

@@ -58,6 +58,10 @@ void ConsoleView::DoKeyPress(int key, int scan, bool repeat, bool shift, bool ct
 		c->NextCommand();
 		break;
 	case SDLK_UP:
+		if (editingNewCommand)
+		{
+			newCommand = commandField->GetText();
+		}
 		c->PreviousCommand();
 		break;
 	default:
@@ -105,7 +109,16 @@ void ConsoleView::NotifyPreviousCommandsChanged(ConsoleModel * sender)
 
 void ConsoleView::NotifyCurrentCommandChanged(ConsoleModel * sender)
 {
-	commandField->SetText(sender->GetCurrentCommand().Command);
+	bool oldEditingNewCommand = editingNewCommand;
+	editingNewCommand = sender->GetCurrentCommandIndex() >= sender->GetPreviousCommands().size();
+	if (!oldEditingNewCommand && editingNewCommand)
+	{
+		commandField->SetText(newCommand);
+	}
+	else
+	{
+		commandField->SetText(sender->GetCurrentCommand().Command);
+	}
 	commandField->SetDisplayText(c->FormatCommand(commandField->GetText()));
 }
 

src/gui/console/ConsoleView.h

@@ -18,6 +18,8 @@ class ConsoleView: public ui::Window
 	ui::Textbox * commandField;
 	std::vector<ui::Label*> commandList;
 	bool doClose = false;
+	String newCommand;
+	bool editingNewCommand = true;
 public:
 	ConsoleView();
 	void OnDraw() override;