Make tab containers in editor, project settings, and export dialog, to use hidden tabs for min size computation.

editor/editor_node.cpp

@@ -889,7 +889,8 @@ bool EditorNode::_find_and_save_edited_subresources(Object *obj, Map<RES, bool>
 						ret_changed = true;
 				}
 			} break;
-			default: {}
+			default: {
+			}
 		}
 	}
 
@@ -5102,6 +5103,7 @@ EditorNode::EditorNode() {
 		dock_slot[i]->set_drag_to_rearrange_enabled(true);
 		dock_slot[i]->set_tabs_rearrange_group(1);
 		dock_slot[i]->connect("tab_changed", this, "_dock_tab_changed");
+		dock_slot[i]->set_use_hidden_tabs_for_min_size(true);
 	}
 
 	dock_drag_timer = memnew(Timer);

editor/project_export.cpp

@@ -1115,6 +1115,7 @@ ProjectExportDialog::ProjectExportDialog() {
 
 	sections = memnew(TabContainer);
 	sections->set_tab_align(TabContainer::ALIGN_LEFT);
+	sections->set_use_hidden_tabs_for_min_size(true);
 	settings_vb->add_child(sections);
 	sections->set_v_size_flags(SIZE_EXPAND_FILL);
 

editor/project_settings_editor.cpp

@@ -294,7 +294,8 @@ void ProjectSettingsEditor::_device_input_add() {
 			ie = jb;
 
 		} break;
-		default: {}
+		default: {
+		}
 	}
 
 	if (idx < 0 || idx >= events.size()) {
@@ -519,7 +520,8 @@ void ProjectSettingsEditor::_add_item(int p_item, Ref<InputEvent> p_exiting_even
 			}
 
 		} break;
-		default: {}
+		default: {
+		}
 	}
 }
 
@@ -1679,6 +1681,7 @@ ProjectSettingsEditor::ProjectSettingsEditor(EditorData *p_data) {
 
 	tab_container = memnew(TabContainer);
 	tab_container->set_tab_align(TabContainer::ALIGN_LEFT);
+	tab_container->set_use_hidden_tabs_for_min_size(true);
 	add_child(tab_container);
 
 	VBoxContainer *props_base = memnew(VBoxContainer);

scene/gui/tab_container.cpp

@@ -791,7 +791,7 @@ Size2 TabContainer::get_minimum_size() const {
 
 		Control *c = tabs[i];
 
-		if (!c->is_visible_in_tree())
+		if (!c->is_visible_in_tree() && !use_hidden_tabs_for_min_size)
 			continue;
 
 		Size2 cms = c->get_combined_minimum_size();
@@ -838,6 +838,13 @@ int TabContainer::get_tabs_rearrange_group() const {
 	return tabs_rearrange_group;
 }
 
+void TabContainer::set_use_hidden_tabs_for_min_size(bool p_use_hidden_tabs) {
+	use_hidden_tabs_for_min_size = p_use_hidden_tabs;
+}
+
+bool TabContainer::get_use_hidden_tabs_for_min_size() const {
+	return use_hidden_tabs_for_min_size;
+}
 void TabContainer::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("_gui_input"), &TabContainer::_gui_input);
@@ -864,6 +871,9 @@ void TabContainer::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_tabs_rearrange_group", "group_id"), &TabContainer::set_tabs_rearrange_group);
 	ClassDB::bind_method(D_METHOD("get_tabs_rearrange_group"), &TabContainer::get_tabs_rearrange_group);
 
+	ClassDB::bind_method(D_METHOD("set_use_hidden_tabs_for_min_size", "enabled"), &TabContainer::set_use_hidden_tabs_for_min_size);
+	ClassDB::bind_method(D_METHOD("get_use_hidden_tabs_for_min_size"), &TabContainer::get_use_hidden_tabs_for_min_size);
+
 	ClassDB::bind_method(D_METHOD("_child_renamed_callback"), &TabContainer::_child_renamed_callback);
 	ClassDB::bind_method(D_METHOD("_on_theme_changed"), &TabContainer::_on_theme_changed);
 	ClassDB::bind_method(D_METHOD("_update_current_tab"), &TabContainer::_update_current_tab);
@@ -876,6 +886,7 @@ void TabContainer::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "current_tab", PROPERTY_HINT_RANGE, "-1,4096,1", PROPERTY_USAGE_EDITOR), "set_current_tab", "get_current_tab");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "tabs_visible"), "set_tabs_visible", "are_tabs_visible");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "drag_to_rearrange_enabled"), "set_drag_to_rearrange_enabled", "get_drag_to_rearrange_enabled");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_hidden_tabs_for_min_size"), "set_use_hidden_tabs_for_min_size", "get_use_hidden_tabs_for_min_size");
 
 	BIND_ENUM_CONSTANT(ALIGN_LEFT);
 	BIND_ENUM_CONSTANT(ALIGN_CENTER);
@@ -896,4 +907,5 @@ TabContainer::TabContainer() {
 	popup = NULL;
 	drag_to_rearrange_enabled = false;
 	tabs_rearrange_group = -1;
+	use_hidden_tabs_for_min_size = false;
 }

scene/gui/tab_container.h

@@ -59,6 +59,7 @@ private:
 	int _get_top_margin() const;
 	Popup *popup;
 	bool drag_to_rearrange_enabled;
+	bool use_hidden_tabs_for_min_size;
 	int tabs_rearrange_group;
 
 	Vector<Control *> _get_tabs() const;
@@ -115,6 +116,8 @@ public:
 	bool get_drag_to_rearrange_enabled() const;
 	void set_tabs_rearrange_group(int p_group_id);
 	int get_tabs_rearrange_group() const;
+	void set_use_hidden_tabs_for_min_size(bool p_use_hidden_tabs);
+	bool get_use_hidden_tabs_for_min_size() const;
 
 	TabContainer();
 };