'tab_changed' signal after using 'set_current_tab'
'tab_changed' signal after using 'set_current_tab'

closes #10051

DmitriySalnikov/godot,RandomShaper/godot,ageazrael/godot,Shockblast/godot,NateWardawg/godot,BastiaanOlij/godot,mcanders/godot,godotengine/godot,Valentactive/godot,mcanders/godot,sanikoyes/godot,Shockblast/godot,godotengine/godot,n-pigeon/godot,RandomShaper/godot,guilhermefelipecgs/godot,vkbsb/godot,Paulloz/godot,NateWardawg/godot,mcanders/godot,ex/godot,Paulloz/godot,Shockblast/godot,Shockblast/godot,okamstudio/godot,ex/godot,guilhermefelipecgs/godot,sanikoyes/godot,RandomShaper/godot,NateWardawg/godot,ZuBsPaCe/godot,Brickcaster/godot,zicklag/godot,firefly2442/godot,guilhermefelipecgs/godot,mcanders/godot,Paulloz/godot,Valentactive/godot,firefly2442/godot,sanikoyes/godot,NateWardawg/godot,godotengine/godot,ex/godot,honix/godot,Zylann/godot,godotengine/godot,firefly2442/godot,Faless/godot,jejung/godot,okamstudio/godot,vkbsb/godot,sanikoyes/godot,Paulloz/godot,groud/godot,honix/godot,MarianoGnu/godot,Brickcaster/godot,ageazrael/godot,vkbsb/godot,ZuBsPaCe/godot,ex/godot,guilhermefelipecgs/godot,godotengine/godot,Valentactive/godot,akien-mga/godot,MarianoGnu/godot,vkbsb/godot,vkbsb/godot,DmitriySalnikov/godot,groud/godot,n-pigeon/godot,ex/godot,Zylann/godot,n-pigeon/godot,pkowal1982/godot,pkowal1982/godot,vkbsb/godot,sanikoyes/godot,guilhermefelipecgs/godot,RandomShaper/godot,Faless/godot,akien-mga/godot,BastiaanOlij/godot,pkowal1982/godot,Brickcaster/godot,MarianoGnu/godot,zicklag/godot,okamstudio/godot,akien-mga/godot,akien-mga/godot,DmitriySalnikov/godot,FateAce/godot,DmitriySalnikov/godot,Shockblast/godot,ex/godot,sanikoyes/godot,sanikoyes/godot,Valentactive/godot,Brickcaster/godot,honix/godot,akien-mga/godot,Paulloz/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,Zylann/godot,jejung/godot,ageazrael/godot,Shockblast/godot,Paulloz/godot,mcanders/godot,Shockblast/godot,groud/godot,pkowal1982/godot,NateWardawg/godot,guilhermefelipecgs/godot,MarianoGnu/godot,Faless/godot,BastiaanOlij/godot,Faless/godot,josempans/godot,pkowal1982/godot,MarianoGnu/godot,RandomShaper/godot,okamstudio/godot,FateAce/godot,FateAce/godot,Faless/godot,NateWardawg/godot,jejung/godot,okamstudio/godot,groud/godot,Zylann/godot,zicklag/godot,akien-mga/godot,RandomShaper/godot,Zylann/godot,n-pigeon/godot,pkowal1982/godot,Brickcaster/godot,firefly2442/godot,pkowal1982/godot,BastiaanOlij/godot,josempans/godot,okamstudio/godot,vnen/godot,josempans/godot,ZuBsPaCe/godot,BastiaanOlij/godot,godotengine/godot,honix/godot,josempans/godot,ZuBsPaCe/godot,vnen/godot,ageazrael/godot,Brickcaster/godot,Valentactive/godot,zicklag/godot,honix/godot,groud/godot,okamstudio/godot,NateWardawg/godot,ex/godot,jejung/godot,josempans/godot,Faless/godot,ex/godot,vkbsb/godot,Valentactive/godot,godotengine/godot,Faless/godot,honix/godot,vnen/godot,MarianoGnu/godot,okamstudio/godot,Valentactive/godot,josempans/godot,n-pigeon/godot,Shockblast/godot,Zylann/godot,DmitriySalnikov/godot,NateWardawg/godot,mcanders/godot,FateAce/godot,vnen/godot,akien-mga/godot,jejung/godot,DmitriySalnikov/godot,MarianoGnu/godot,Zylann/godot,BastiaanOlij/godot,josempans/godot,ageazrael/godot,DmitriySalnikov/godot,ageazrael/godot,vnen/godot,ageazrael/godot,firefly2442/godot,zicklag/godot,BastiaanOlij/godot,NateWardawg/godot,Faless/godot,zicklag/godot,BastiaanOlij/godot,guilhermefelipecgs/godot,firefly2442/godot,pkowal1982/godot,MarianoGnu/godot,n-pigeon/godot,FateAce/godot,FateAce/godot,vnen/godot,groud/godot,ZuBsPaCe/godot,firefly2442/godot,ZuBsPaCe/godot,firefly2442/godot,Zylann/godot,sanikoyes/godot,vkbsb/godot,Brickcaster/godot,jejung/godot,RandomShaper/godot,godotengine/godot,n-pigeon/godot,akien-mga/godot,josempans/godot,vnen/godot,Paulloz/godot,Valentactive/godot,okamstudio/godot,okamstudio/godot,ZuBsPaCe/godot,vnen/godot