Fix problems with concave shapes in the TileSet editor
Fix problems with concave shapes in the TileSet editor

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