Fixes TileMap editor copy bug.
Fixes TileMap editor copy bug.

guilhermefelipecgs/godot,pkowal1982/godot,godotengine/godot,Zylann/godot,Faless/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,honix/godot,Faless/godot,BastiaanOlij/godot,Valentactive/godot,vnen/godot,firefly2442/godot,honix/godot,ZuBsPaCe/godot,Zylann/godot,BastiaanOlij/godot,godotengine/godot,Valentactive/godot,guilhermefelipecgs/godot,firefly2442/godot,BastiaanOlij/godot,Valentactive/godot,akien-mga/godot,Shockblast/godot,guilhermefelipecgs/godot,MarianoGnu/godot,akien-mga/godot,akien-mga/godot,guilhermefelipecgs/godot,Shockblast/godot,Valentactive/godot,Valentactive/godot,vkbsb/godot,firefly2442/godot,ZuBsPaCe/godot,Faless/godot,honix/godot,vkbsb/godot,Faless/godot,josempans/godot,Zylann/godot,sanikoyes/godot,DmitriySalnikov/godot,firefly2442/godot,sanikoyes/godot,josempans/godot,honix/godot,Zylann/godot,godotengine/godot,Zylann/godot,josempans/godot,firefly2442/godot,DmitriySalnikov/godot,Shockblast/godot,vnen/godot,sanikoyes/godot,vkbsb/godot,akien-mga/godot,Zylann/godot,Shockblast/godot,ZuBsPaCe/godot,pkowal1982/godot,BastiaanOlij/godot,honix/godot,akien-mga/godot,ZuBsPaCe/godot,Valentactive/godot,pkowal1982/godot,honix/godot,sanikoyes/godot,MarianoGnu/godot,vkbsb/godot,MarianoGnu/godot,guilhermefelipecgs/godot,josempans/godot,BastiaanOlij/godot,Faless/godot,josempans/godot,akien-mga/godot,MarianoGnu/godot,akien-mga/godot,pkowal1982/godot,BastiaanOlij/godot,godotengine/godot,godotengine/godot,Valentactive/godot,sanikoyes/godot,pkowal1982/godot,DmitriySalnikov/godot,ZuBsPaCe/godot,MarianoGnu/godot,MarianoGnu/godot,vnen/godot,godotengine/godot,MarianoGnu/godot,firefly2442/godot,Shockblast/godot,sanikoyes/godot,vkbsb/godot,vnen/godot,akien-mga/godot,vkbsb/godot,Shockblast/godot,pkowal1982/godot,vnen/godot,guilhermefelipecgs/godot,DmitriySalnikov/godot,BastiaanOlij/godot,Valentactive/godot,DmitriySalnikov/godot,vnen/godot,Faless/godot,pkowal1982/godot,BastiaanOlij/godot,vnen/godot,vkbsb/godot,ZuBsPaCe/godot,Zylann/godot,godotengine/godot,MarianoGnu/godot,josempans/godot,Shockblast/godot,firefly2442/godot,Shockblast/godot,sanikoyes/godot,Faless/godot,josempans/godot,vkbsb/godot,DmitriySalnikov/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,pkowal1982/godot,vnen/godot,Zylann/godot,sanikoyes/godot,godotengine/godot,firefly2442/godot,DmitriySalnikov/godot,Faless/godot,josempans/godot