Use a different color for folder icons in file dialogs

This makes them easier to distinguish from files for quick
visual grepping.

This can also be used in projects by setting the FileDialog "folder"
color. The default value (`Color(1, 1, 1)`) has no visual impact,
for compatibility with existing projects.

editor/editor_file_dialog.cpp

@@ -257,6 +257,7 @@ void EditorFileDialog::_post_popup() {
 
 	if (is_visible_in_tree()) {
 		Ref<Texture> folder = get_icon("folder", "FileDialog");
+		const Color folder_color = get_color("folder", "FileDialog");
 		recent->clear();
 
 		bool res = access == ACCESS_RESOURCES;
@@ -274,6 +275,7 @@ void EditorFileDialog::_post_popup() {
 
 			recent->add_item(name, folder);
 			recent->set_item_metadata(recent->get_item_count() - 1, recentd[i]);
+			recent->set_item_icon_modulate(recent->get_item_count() - 1, folder_color);
 		}
 
 		local_history.clear();
@@ -734,6 +736,7 @@ void EditorFileDialog::update_file_list() {
 	dir_access->list_dir_begin();
 
 	Ref<Texture> folder = get_icon("folder", "FileDialog");
+	const Color folder_color = get_color("folder", "FileDialog");
 	List<String> files;
 	List<String> dirs;
 
@@ -774,6 +777,7 @@ void EditorFileDialog::update_file_list() {
 		d["dir"] = true;
 
 		item_list->set_item_metadata(item_list->get_item_count() - 1, d);
+		item_list->set_item_icon_modulate(item_list->get_item_count() - 1, folder_color);
 
 		dirs.pop_front();
 	}
@@ -1200,6 +1204,7 @@ void EditorFileDialog::_update_favorites() {
 
 	String current = get_current_dir();
 	Ref<Texture> folder_icon = get_icon("Folder", "EditorIcons");
+	const Color folder_color = get_color("folder", "FileDialog");
 	favorites->clear();
 
 	favorite->set_pressed(false);
@@ -1230,6 +1235,7 @@ void EditorFileDialog::_update_favorites() {
 		}
 
 		favorites->set_item_metadata(favorites->get_item_count() - 1, favorited[i]);
+		favorites->set_item_icon_modulate(favorites->get_item_count() - 1, folder_color);
 
 		if (setthis) {
 			favorite->set_pressed(true);

editor/editor_themes.cpp

@@ -1066,6 +1066,9 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 
 	// FileDialog
 	theme->set_icon("folder", "FileDialog", theme->get_icon("Folder", "EditorIcons"));
+	// Use a different color for folder icons to make them easier to distinguish from files.
+	// On a light theme, the icon will be dark, so we need to lighten it before blending it with the accent color.
+	theme->set_color("folder", "FileDialog", (dark_theme ? Color(1, 1, 1) : Color(5, 5, 5)).linear_interpolate(accent_color, 0.7));
 	theme->set_color("files_disabled", "FileDialog", font_color_disabled);
 
 	// color picker

editor/filesystem_dock.cpp

@@ -64,6 +64,7 @@ bool FileSystemDock::_create_tree(TreeItem *p_parent, EditorFileSystemDirectory
 
 	subdirectory_item->set_text(0, dname);
 	subdirectory_item->set_icon(0, get_icon("Folder", "EditorIcons"));
+	subdirectory_item->set_icon_color(0, get_color("folder", "FileDialog"));
 	subdirectory_item->set_selectable(0, true);
 	String lpath = p_dir->get_path();
 	subdirectory_item->set_metadata(0, lpath);
@@ -186,15 +187,19 @@ void FileSystemDock::_update_tree(const Vector<String> &p_uncollapsed_paths, boo
 			continue;
 
 		Ref<Texture> folder_icon = get_icon("Folder", "EditorIcons");
+		const Color folder_color = get_color("folder", "FileDialog");
 
 		String text;
 		Ref<Texture> icon;
+		Color color;
 		if (fave == "res://") {
 			text = "/";
 			icon = folder_icon;
+			color = folder_color;
 		} else if (fave.ends_with("/")) {
 			text = fave.substr(0, fave.length() - 1).get_file();
 			icon = folder_icon;
+			color = folder_color;
 		} else {
 			text = fave.get_file();
 			int index;
@@ -204,12 +209,14 @@ void FileSystemDock::_update_tree(const Vector<String> &p_uncollapsed_paths, boo
 			} else {
 				icon = get_icon("File", "EditorIcons");
 			}
+			color = Color(1, 1, 1);
 		}
 
 		if (searched_string.length() == 0 || text.to_lower().find(searched_string) >= 0) {
 			TreeItem *ti = tree->create_item(favorites);
 			ti->set_text(0, text);
 			ti->set_icon(0, icon);
+			ti->set_icon_color(0, color);
 			ti->set_tooltip(0, fave);
 			ti->set_selectable(0, true);
 			ti->set_metadata(0, fave);
@@ -639,6 +646,7 @@ void FileSystemDock::_update_file_list(bool p_keep_selection) {
 	}
 
 	Ref<Texture> folder_icon = (use_thumbnails) ? folder_thumbnail : get_icon("folder", "FileDialog");
+	const Color folder_color = get_color("folder", "FileDialog");
 
 	// Build the FileInfo list
 	List<FileInfo> filelist;
@@ -716,6 +724,7 @@ void FileSystemDock::_update_file_list(bool p_keep_selection) {
 
 					files->set_item_metadata(files->get_item_count() - 1, bd);
 					files->set_item_selectable(files->get_item_count() - 1, false);
+					files->set_item_icon_modulate(files->get_item_count() - 1, folder_color);
 				}
 
 				for (int i = 0; i < efd->get_subdir_count(); i++) {
@@ -724,6 +733,7 @@ void FileSystemDock::_update_file_list(bool p_keep_selection) {
 
 					files->add_item(dname, folder_icon, true);
 					files->set_item_metadata(files->get_item_count() - 1, directory.plus_file(dname) + "/");
+					files->set_item_icon_modulate(files->get_item_count() - 1, folder_color);
 
 					if (cselection.has(dname)) {
 						files->select(files->get_item_count() - 1, false);

scene/gui/file_dialog.cpp

@@ -400,6 +400,7 @@ void FileDialog::update_file_list() {
 
 	TreeItem *root = tree->create_item();
 	Ref<Texture> folder = get_icon("folder");
+	const Color folder_color = get_color("folder");
 	List<String> files;
 	List<String> dirs;
 
@@ -429,6 +430,7 @@ void FileDialog::update_file_list() {
 		TreeItem *ti = tree->create_item(root);
 		ti->set_text(0, dir_name);
 		ti->set_icon(0, folder);
+		ti->set_icon_color(0, folder_color);
 
 		Dictionary d;
 		d["name"] = dir_name;

scene/resources/default_theme/default_theme.cpp

@@ -760,6 +760,7 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 	// FileDialog
 
 	theme->set_icon("folder", "FileDialog", make_icon(icon_folder_png));
+	theme->set_color("folder", "FileDialog", Color(1, 1, 1));
 	theme->set_color("files_disabled", "FileDialog", Color(0, 0, 0, 0.7));
 
 	// colorPicker