Fix bug #1745396: "MI: Saved game from the credits sequence fails to load".

Now we specifically disallow saves in room 0 for all v4+ games. Original
has exactly this check in all versions, and such games are impossible to load.

Still the problem is not resolved for v0-v3 and HE games.

svn-id: r42664

3 files changed, 18 insertions, 1 deletions

diff --git a/engines/scumm/dialogs.cpp b/engines/scumm/dialogs.cpp
index 880fab04a5..bef267f6f2 100644
--- a/engines/scumm/dialogs.cpp
+++ b/engines/scumm/dialogs.cpp
@@ -439,7 +439,7 @@ ScummMenuDialog::ScummMenuDialog(ScummEngine *scumm)
 	new GUI::ButtonWidget(this, "ScummMain.Resume", "Resume", kPlayCmd, 'P');
 
 	new GUI::ButtonWidget(this, "ScummMain.Load", "Load", kLoadCmd, 'L');
-	new GUI::ButtonWidget(this, "ScummMain.Save", "Save", kSaveCmd, 'S');
+	_saveButton = new GUI::ButtonWidget(this, "ScummMain.Save", "Save", kSaveCmd, 'S');
 
 	new GUI::ButtonWidget(this, "ScummMain.Options", "Options", kOptionsCmd, 'O');
 #ifndef DISABLE_HELP
@@ -471,6 +471,15 @@ ScummMenuDialog::~ScummMenuDialog() {
 	delete _loadDialog;
 }
 
+void ScummMenuDialog::reflowLayout() {
+	// For v4+ games do not allow to save in room 0 just as original did.
+	// It is not possible to load such saves
+	if ((_vm->_game.version >= 4) && (_vm->_currentRoom == 0))
+		_saveButton->setEnabled(false);
+
+	Dialog::reflowLayout();
+}
+
 void ScummMenuDialog::handleCommand(CommandSender *sender, uint32 cmd, uint32 data) {
 	switch (cmd) {
 	case kSaveCmd:
diff --git a/engines/scumm/dialogs.h b/engines/scumm/dialogs.h
index af844272fa..d4ecbde534 100644
--- a/engines/scumm/dialogs.h
+++ b/engines/scumm/dialogs.h
@@ -88,6 +88,8 @@ public:
 	~ScummMenuDialog();
 	virtual void handleCommand(GUI::CommandSender *sender, uint32 cmd, uint32 data);
 
+	virtual void reflowLayout();
+
 protected:
 	ScummEngine		*_vm;
 
@@ -99,6 +101,8 @@ protected:
 	SaveLoadChooser	*_saveDialog;
 	SaveLoadChooser	*_loadDialog;
 
+	GUI::ButtonWidget *_saveButton;
+
 	void save();
 	void load();
 };
diff --git a/engines/scumm/saveload.cpp b/engines/scumm/saveload.cpp
index d474a43b05..4d131b41be 100644
--- a/engines/scumm/saveload.cpp
+++ b/engines/scumm/saveload.cpp
@@ -95,6 +95,10 @@ Common::Error ScummEngine::saveGameState(int slot, const char *desc) {
 }
 
 bool ScummEngine::canSaveGameStateCurrently() {
+	// For v4+ games do not allow to save in room 0
+	if (_game.version >= 4)
+		return (_currentRoom != 0);
+
 	// FIXME: For now always allow loading in V0-V3 games
 	// TODO: Should we disallow saving in some more places,
 	// e.g. when a SAN movie is playing? Not sure whether the