Fix bottom panel visibility behaviour in the theme editor
Fix bottom panel visibility behaviour in the theme editor

Fixes #29034, fixes #29056

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