Implement Tree Search Functionality with Highlighting and Filtering

This commit introduces a comprehensive Tree Search feature, including:
- Tree highlighting: Highlights items that match the search query.
- Tree filtering: Filters items so only matches and descendants are
  shown.
- Counting descendants: Shows the number of matching items within collapsed branches.
- Jump to next match: on enter.
- (Limbo-)Shortcut: Default CTRL-F.
- Menu entry: Misc->Search Tree.
- Remember separate SearchInfo for each tab.

Key implementation details:
- Optimized performance for large trees
- Implemented recursive filtering for efficiency
- Added UI elements including next/previous match buttons

Development History:
- Initial implementation of highlighting and filtering
- Multiple rounds of performance optimization
- Bug fixes and refactoring for correctness
- UI enhancements and polish
- Code cleanup and style improvements

editor/limbo_ai_editor_plugin.cpp

@@ -261,6 +261,10 @@ void LimboAIEditor::edit_bt(const Ref<BehaviorTree> &p_behavior_tree, bool p_for
 	p_behavior_tree->editor_set_section_unfold("blackboard_plan", true);
 	p_behavior_tree->notify_property_list_changed();
 #endif // LIMBOAI_MODULE
+	// Remember current search info.
+	if (idx_history >= 0 && idx_history < history.size()) {
+		tab_search_context.insert(history[idx_history], task_tree->tree_search_get_search_info());
+	}
 
 	task_tree->load_bt(p_behavior_tree);
 
@@ -280,6 +284,18 @@ void LimboAIEditor::edit_bt(const Ref<BehaviorTree> &p_behavior_tree, bool p_for
 	task_tree->show();
 	task_palette->show();
 
+	// Restore search info from [tab_search_context].
+	if (idx_history >= 0 && idx_history < history.size()) {
+		// info for BehaviorTree available. Restore!
+		if (tab_search_context.has(history[idx_history])) {
+			task_tree->tree_search_set_search_info(tab_search_context[history[idx_history]]);
+		}
+		// new SearchContext.
+		else {
+			task_tree->tree_search_set_search_info(TreeSearch::SearchInfo());
+		}
+	}
+
 	_update_tabs();
 }
 
@@ -457,6 +473,8 @@ void LimboAIEditor::_process_shortcut_input(const Ref<InputEvent> &p_event) {
 			_on_save_pressed();
 		} else if (LW_IS_SHORTCUT("limbo_ai/load_behavior_tree", p_event)) {
 			_popup_file_dialog(load_dialog);
+		} else if (LW_IS_SHORTCUT("limbo_ai/find_task", p_event)) {
+			task_tree->tree_search_show_and_focus();
 		} else {
 			handled = false;
 		}
@@ -799,6 +817,9 @@ void LimboAIEditor::_misc_option_selected(int p_id) {
 			EDITOR_FILE_SYSTEM()->scan();
 			EDIT_SCRIPT(template_path);
 		} break;
+		case MISC_SEARCH_TREE: {
+			task_tree->tree_search_show_and_focus();
+		}
 	}
 }
 
@@ -1319,6 +1340,9 @@ void LimboAIEditor::_update_misc_menu() {
 	misc_menu->add_item(
 			FILE_EXISTS(_get_script_template_path()) ? TTR("Edit Script Template") : TTR("Create Script Template"),
 			MISC_CREATE_SCRIPT_TEMPLATE);
+
+	misc_menu->add_separator();
+	misc_menu->add_icon_shortcut(theme_cache.search_icon, LW_GET_SHORTCUT("limbo_ai/find_task"), MISC_SEARCH_TREE);
 }
 
 void LimboAIEditor::_update_banners() {
@@ -1381,6 +1405,7 @@ void LimboAIEditor::_do_update_theme_item_cache() {
 	theme_cache.cut_icon = get_theme_icon(LW_NAME(ActionCut), LW_NAME(EditorIcons));
 	theme_cache.copy_icon = get_theme_icon(LW_NAME(ActionCopy), LW_NAME(EditorIcons));
 	theme_cache.paste_icon = get_theme_icon(LW_NAME(ActionPaste), LW_NAME(EditorIcons));
+	theme_cache.search_icon = get_theme_icon(LW_NAME(Search), LW_NAME(EditorIcons));
 
 	theme_cache.behavior_tree_icon = LimboUtility::get_singleton()->get_task_icon("BehaviorTree");
 	theme_cache.percent_icon = LimboUtility::get_singleton()->get_task_icon("LimboPercent");
@@ -1512,6 +1537,8 @@ LimboAIEditor::LimboAIEditor() {
 	LW_SHORTCUT("limbo_ai/open_debugger", TTR("Open Debugger"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY_MASK(ALT) | LW_KEY(D)));
 	LW_SHORTCUT("limbo_ai/jump_to_owner", TTR("Jump to Owner"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(J)));
 	LW_SHORTCUT("limbo_ai/close_tab", TTR("Close Tab"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(W)));
+	LW_SHORTCUT("limbo_ai/find_task", TTR("Find Task"), (Key)(LW_KEY_MASK(CMD_OR_CTRL) | LW_KEY(F)));
+	LW_SHORTCUT("limbo_ai/hide_tree_search", TTR("Close Search"), (Key)(LW_KEY(ESCAPE)));
 
 	set_process_shortcut_input(true);
 

editor/limbo_ai_editor_plugin.h

@@ -20,6 +20,7 @@
 #include "owner_picker.h"
 #include "task_palette.h"
 #include "task_tree.h"
+#include "tree_search.h"
 
 #ifdef LIMBOAI_MODULE
 #include "core/object/class_db.h"
@@ -47,6 +48,7 @@
 
 #ifdef LIMBOAI_GDEXTENSION
 #include "godot_cpp/classes/accept_dialog.hpp"
+#include <godot_cpp/classes/config_file.hpp>
 #include <godot_cpp/classes/control.hpp>
 #include <godot_cpp/classes/editor_plugin.hpp>
 #include <godot_cpp/classes/editor_spin_slider.hpp>
@@ -63,7 +65,6 @@
 #include <godot_cpp/classes/texture2d.hpp>
 #include <godot_cpp/variant/packed_string_array.hpp>
 #include <godot_cpp/variant/variant.hpp>
-#include <godot_cpp/classes/config_file.hpp>
 
 using namespace godot;
 
@@ -100,6 +101,7 @@ class LimboAIEditor : public Control {
 		MISC_LAYOUT_WIDESCREEN_OPTIMIZED,
 		MISC_PROJECT_SETTINGS,
 		MISC_CREATE_SCRIPT_TEMPLATE,
+		MISC_SEARCH_TREE
 	};
 
 	enum TabMenu {
@@ -134,12 +136,14 @@ class LimboAIEditor : public Control {
 		Ref<Texture2D> cut_icon;
 		Ref<Texture2D> copy_icon;
 		Ref<Texture2D> paste_icon;
+		Ref<Texture2D> search_icon;
 	} theme_cache;
 
 	EditorPlugin *plugin;
 	EditorLayout editor_layout;
 	Vector<Ref<BehaviorTree>> history;
 	int idx_history;
+	HashMap<Ref<BehaviorTree>, TreeSearch::SearchInfo> tab_search_context;
 	bool updating_tabs = false;
 	bool request_update_tabs = false;
 	HashSet<Ref<BehaviorTree>> dirty;

editor/task_tree.cpp

@@ -17,22 +17,23 @@
 #include "../bt/tasks/composites/bt_probability_selector.h"
 #include "../util/limbo_compat.h"
 #include "../util/limbo_utility.h"
+#include "tree_search.h"
 
 #ifdef LIMBOAI_MODULE
 #include "core/object/script_language.h"
 #include "editor/themes/editor_scale.h"
 #include "scene/gui/box_container.h"
-#include "scene/gui/texture_rect.h"
 #include "scene/gui/label.h"
+#include "scene/gui/texture_rect.h"
 #endif // LIMBOAI_MODULE
 
 #ifdef LIMBOAI_GDEXTENSION
 #include <godot_cpp/classes/editor_interface.hpp>
-#include <godot_cpp/classes/script.hpp>
 #include <godot_cpp/classes/h_box_container.hpp>
-#include <godot_cpp/classes/v_box_container.hpp>
-#include <godot_cpp/classes/texture_rect.hpp>
 #include <godot_cpp/classes/label.hpp>
+#include <godot_cpp/classes/script.hpp>
+#include <godot_cpp/classes/texture_rect.hpp>
+#include <godot_cpp/classes/v_box_container.hpp>
 using namespace godot;
 #endif // LIMBOAI_GDEXTENSION
 
@@ -46,6 +47,12 @@ TreeItem *TaskTree::_create_tree(const Ref<BTTask> &p_task, TreeItem *p_parent,
 		_create_tree(p_task->get_child(i), item);
 	}
 	_update_item(item);
+
+	// update TreeSearch if root task was created
+	if (tree->get_root() == item) {
+		tree_search->update_search(tree);
+	}
+
 	return item;
 }
 
@@ -105,6 +112,7 @@ void TaskTree::_update_item(TreeItem *p_item) {
 	if (!warning_text.is_empty()) {
 		p_item->add_button(0, theme_cache.task_warning_icon, 0, false, warning_text);
 	}
+	tree_search->notify_item_edited(p_item); // this is necessary to preserve custom drawing from tree search.
 }
 
 void TaskTree::_update_tree() {
@@ -434,7 +442,7 @@ void TaskTree::_normalize_drop(TreeItem *item, int type, int &to_pos, Ref<BTTask
 			to_pos = to_task->get_index();
 			{
 				Vector<Ref<BTTask>> selected = get_selected_tasks();
-				if (to_task == selected[selected.size()-1]) {
+				if (to_task == selected[selected.size() - 1]) {
 					to_pos += 1;
 				}
 			}
@@ -530,6 +538,8 @@ void TaskTree::_notification(int p_what) {
 			tree->connect("multi_selected", callable_mp(this, &TaskTree::_on_item_selected).unbind(3), CONNECT_DEFERRED);
 			tree->connect("item_activated", callable_mp(this, &TaskTree::_on_item_activated));
 			tree->connect("item_collapsed", callable_mp(this, &TaskTree::_on_item_collapsed));
+			tree_search_panel->connect("update_requested", callable_mp(tree_search.ptr(), &TreeSearch::update_search).bind(tree));
+			tree_search_panel->connect("visibility_changed", callable_mp(tree_search.ptr(), &TreeSearch::update_search).bind(tree));
 		} break;
 		case NOTIFICATION_THEME_CHANGED: {
 			_do_update_theme_item_cache();
@@ -562,12 +572,38 @@ void TaskTree::_bind_methods() {
 			PropertyInfo(Variant::INT, "type")));
 }
 
+// TreeSearch API
+void TaskTree::tree_search_show_and_focus() {
+	ERR_FAIL_NULL(tree_search);
+	tree_search_panel->set_visible(true);
+	tree_search_panel->focus_editor();
+}
+
+TreeSearch::SearchInfo TaskTree::tree_search_get_search_info() const {
+	if (!tree_search.is_valid()) {
+		return TreeSearch::SearchInfo();
+	}
+	return tree_search_panel->get_search_info();
+}
+
+void TaskTree::tree_search_set_search_info(const TreeSearch::SearchInfo &p_search_info) {
+	ERR_FAIL_NULL(tree_search);
+	tree_search_panel->set_search_info(p_search_info);
+}
+
+// TreeSearch Api ^
+
 TaskTree::TaskTree() {
 	editable = true;
 	updating_tree = false;
 
+	VBoxContainer *vbox_container = memnew(VBoxContainer);
+	add_child(vbox_container);
+	vbox_container->set_anchors_preset(PRESET_FULL_RECT);
+
 	tree = memnew(Tree);
-	add_child(tree);
+	tree->set_v_size_flags(Control::SIZE_EXPAND_FILL);
+	vbox_container->add_child(tree);
 	tree->set_columns(2);
 	tree->set_column_expand(0, true);
 	tree->set_column_expand(1, false);
@@ -578,6 +614,10 @@ TaskTree::TaskTree() {
 	tree->set_select_mode(Tree::SelectMode::SELECT_MULTI);
 
 	tree->set_drag_forwarding(callable_mp(this, &TaskTree::_get_drag_data_fw), callable_mp(this, &TaskTree::_can_drop_data_fw), callable_mp(this, &TaskTree::_drop_data_fw));
+
+	tree_search_panel = memnew(TreeSearchPanel);
+	tree_search = Ref(memnew(TreeSearch(tree_search_panel)));
+	vbox_container->add_child(tree_search_panel);
 }
 
 TaskTree::~TaskTree() {

editor/task_tree.h

@@ -9,9 +9,13 @@
  * =============================================================================
  */
 
+#ifndef TASK_TREE_H
+#define TASK_TREE_H
+
 #ifdef TOOLS_ENABLED
 
 #include "../bt/behavior_tree.h"
+#include "tree_search.h"
 
 #ifdef LIMBOAI_MODULE
 #include "scene/gui/control.h"
@@ -43,6 +47,9 @@ class TaskTree : public Control {
 	bool updating_tree;
 	HashMap<RECT_CACHE_KEY, Rect2> probability_rect_cache;
 
+	Ref<TreeSearch> tree_search;
+	TreeSearchPanel *tree_search_panel;
+
 	struct ThemeCache {
 		Ref<Font> comment_font;
 		Ref<Font> name_font;
@@ -96,16 +103,21 @@ class TaskTree : public Control {
 	Ref<BTTask> get_selected() const;
 	Vector<Ref<BTTask>> get_selected_tasks() const;
 	void clear_selection();
-
 	Rect2 get_selected_probability_rect() const;
 	double get_selected_probability_weight() const;
 	double get_selected_probability_percent() const;
 	bool selected_has_probability() const;
 
+	// TreeSearch API
+	void tree_search_show_and_focus();
+	TreeSearch::SearchInfo tree_search_get_search_info() const;
+	void tree_search_set_search_info(const TreeSearch::SearchInfo &p_search_info);
+
 	virtual bool editor_can_reload_from_file() { return false; }
 
 	TaskTree();
 	~TaskTree();
 };
 
 #endif // ! TOOLS_ENABLED
+#endif // ! TASK_TREE_H