Re-add removed group collapse/expand all buttons

src/group_gui.cpp

@@ -68,6 +68,10 @@ static const NWidgetPart _nested_group_widgets[] = {
 						SetDataTip(SPR_GROUP_RENAME_TRAIN, STR_GROUP_RENAME_TOOLTIP),
 				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_GL_LIVERY_GROUP), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_LIVERY_TRAIN, STR_GROUP_LIVERY_TOOLTIP),
+				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_GL_COLLAPSE_ALL_GROUPS), SetFill(0, 1),
+						SetDataTip(STR_GROUP_COLLAPSE_ALL, STR_GROUP_COLLAPSE_ALL),
+				NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_GL_EXPAND_ALL_GROUPS), SetFill(0, 1),
+						SetDataTip(STR_GROUP_EXPAND_ALL, STR_GROUP_EXPAND_ALL),
 				NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), EndContainer(),
 				NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_GL_REPLACE_PROTECTION), SetFill(0, 1),
 						SetDataTip(SPR_GROUP_REPLACE_OFF_TRAIN, STR_GROUP_REPLACE_PROTECTION_TOOLTIP),
@@ -185,13 +189,26 @@ private:
 
 		GUIGroupList list;
 
+		bool enable_expand_all = false;
+		bool enable_collapse_all = false;
+
 		const Group *g;
 		FOR_ALL_GROUPS(g) {
 			if (g->owner == owner && g->vehicle_type == this->vli.vtype) {
 				list.push_back(g);
+				if (g->parent != INVALID_GROUP) {
+					if (Group::Get(g->parent)->folded) {
+						enable_expand_all = true;
+					} else {
+						enable_collapse_all = true;
+					}
+				}
 			}
 		}
 
+		this->SetWidgetDisabledState(WID_GL_EXPAND_ALL_GROUPS, !enable_expand_all);
+		this->SetWidgetDisabledState(WID_GL_COLLAPSE_ALL_GROUPS, !enable_collapse_all);
+
 		list.ForceResort();
 		list.Sort(&GroupNameSorter);
 
@@ -344,6 +361,20 @@ private:
 		}
 	}
 
+	void SetAllGroupsFoldState(bool folded)
+	{
+		const Group *g;
+		FOR_ALL_GROUPS(g) {
+			if (g->owner == this->owner && g->vehicle_type == this->vli.vtype) {
+				if (g->parent != INVALID_GROUP) {
+					Group::Get(g->parent)->folded = folded;
+				}
+			}
+		}
+		this->groups.ForceRebuild();
+		this->SetDirty();
+	}
+
 public:
 	VehicleGroupWindow(WindowDesc *desc, WindowNumber window_number) : BaseVehicleListWindow(desc, window_number)
 	{
@@ -780,6 +811,17 @@ public:
 				this->ShowRenameGroupWindow(this->vli.index, false);
 				break;
 
+			case WID_GL_COLLAPSE_ALL_GROUPS: {
+				this->SetAllGroupsFoldState(true);
+				break;
+			}
+
+			case WID_GL_EXPAND_ALL_GROUPS: {
+				this->SetAllGroupsFoldState(false);
+				break;
+			}
+
+
 			case WID_GL_LIVERY_GROUP: // Set group livery
 				ShowCompanyLiveryWindow(this->owner, this->vli.index);
 				break;

src/lang/english.txt

@@ -4139,6 +4139,8 @@ STR_GROUP_CREATE_TOOLTIP                                        :{BLACK}Click to
 STR_GROUP_DELETE_TOOLTIP                                        :{BLACK}Delete the selected group
 STR_GROUP_RENAME_TOOLTIP                                        :{BLACK}Rename the selected group
 STR_GROUP_LIVERY_TOOLTIP                                        :{BLACK}Change livery of the selected group
+STR_GROUP_EXPAND_ALL                                            :{BLACK}Expand all
+STR_GROUP_COLLAPSE_ALL                                          :{BLACK}Collapse all
 STR_GROUP_REPLACE_PROTECTION_TOOLTIP                            :{BLACK}Click to protect this group from global autoreplace
 
 STR_QUERY_GROUP_DELETE_CAPTION                                  :{WHITE}Delete Group

src/lang/german.txt

@@ -3986,6 +3986,8 @@ STR_GROUP_CREATE_TOOLTIP                                        :{BLACK}Neue Gru
 STR_GROUP_DELETE_TOOLTIP                                        :{BLACK}Ausgewählte Gruppe löschen
 STR_GROUP_RENAME_TOOLTIP                                        :{BLACK}Ausgewählte Gruppe umbenennen
 STR_GROUP_LIVERY_TOOLTIP                                        :{BLACK}Farbschema der ausgewählten Gruppe ändern
+STR_GROUP_EXPAND_ALL                                            :{BLACK}Alles ausklappen
+STR_GROUP_COLLAPSE_ALL                                          :{BLACK}Alles einklappen
 STR_GROUP_REPLACE_PROTECTION_TOOLTIP                            :{BLACK}Diese Gruppe von der automatischen Fahrzeugersetzung ausschließen
 
 STR_QUERY_GROUP_DELETE_CAPTION                                  :{WHITE}Gruppe löschen

src/lang/korean.txt

@@ -4139,6 +4139,8 @@ STR_GROUP_CREATE_TOOLTIP                                        :{BLACK}그룹
 STR_GROUP_DELETE_TOOLTIP                                        :{BLACK}선택한 그룹 삭제
 STR_GROUP_RENAME_TOOLTIP                                        :{BLACK}선택한 그룹 이름 바꾸기
 STR_GROUP_LIVERY_TOOLTIP                                        :{BLACK}선택한 그룹의 차량 색상을 변경합니다.
+STR_GROUP_EXPAND_ALL                                            :{BLACK}모두 펼치기
+STR_GROUP_COLLAPSE_ALL                                          :{BLACK}모두 접기
 STR_GROUP_REPLACE_PROTECTION_TOOLTIP                            :{BLACK}클릭하여 전체 자동 교체로부터 이 그룹을 보호합니다.
 
 STR_QUERY_GROUP_DELETE_CAPTION                                  :{WHITE}그룹 삭제

src/widgets/group_widget.h

@@ -34,6 +34,8 @@ enum GroupListWidgets {
 	WID_GL_DELETE_GROUP,             ///< Delete group button.
 	WID_GL_RENAME_GROUP,             ///< Rename group button.
 	WID_GL_LIVERY_GROUP,             ///< Group livery button.
+	WID_GL_COLLAPSE_ALL_GROUPS,      ///< Collapse all groups button.
+	WID_GL_EXPAND_ALL_GROUPS,        ///< Expand all groups button.
 	WID_GL_REPLACE_PROTECTION,       ///< Replace protection button.
 	WID_GL_INFO,                     ///< Group info.
 };