Better horizontal scroll for Tree
Better horizontal scroll for Tree

* Adds pan gesture support for horizontal scroll.
* Scrolls horizontally when needed to ensure cursor visiblility.

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