(svn r26670) [1.4] -Backport from trunk:

- Fix: CargoPacket::SourceStation() returns a StationID (r26660)
- Fix: Production cheat cannot be allowed to be active in multiplayer for desync reasons, even when activated in singleplayer previously [FS#6044] (r26656)
- Fix: Make sure an 'abs' is used that supports int64 when using 'abs' on those variables (r26651)
- Fix: Support save/load chunk lengths of up to (1 << 32) - 1 [FS#6041] (r26650)

src/industry_gui.cpp

@@ -24,6 +24,7 @@
 #include "newgrf_industries.h"
 #include "newgrf_text.h"
 #include "newgrf_debug.h"
+#include "network/network.h"
 #include "strings_func.h"
 #include "company_func.h"
 #include "tilehighlight_func.h"
@@ -653,7 +654,8 @@ static inline bool IsProductionAlterable(const Industry *i)
 {
 	const IndustrySpec *is = GetIndustrySpec(i->type);
 	return ((_game_mode == GM_EDITOR || _cheats.setup_prod.value) &&
-			(is->production_rate[0] != 0 || is->production_rate[1] != 0 || is->IsRawIndustry()));
+			(is->production_rate[0] != 0 || is->production_rate[1] != 0 || is->IsRawIndustry()) &&
+			!_networking);
 }
 
 class IndustryViewWindow : public Window