[HTML5] Drag and drop zip in project manager.

With a very nice hack, a new hidden configuration option that delays
dropped files removal at exit.

This still leaks while the project manager is running, but will clear
memory as soon as it exits or load something.
(reminder, dropped files are reguarly removed after the signal is
emitted specifically to avoid leaks, but I prefer hacking the HTML5
config then the project manager).

misc/dist/html/editor.html

@@ -502,7 +502,7 @@
 									showTab('loader');
 									setLoaderEnabled(true);
 								};
-								editor.start({'args': args});
+								editor.start({'args': args, 'persistentDrops': is_project_manager});
 							});
 						}, 0);
 						OnEditorExit = null;
@@ -563,7 +563,7 @@
 					//selectVideoMode();
 					showTab('editor');
 					setLoaderEnabled(false);
-					editor.start({'args': ['--video-driver', video_driver]}).then(function() {
+					editor.start({'args': ['--project-manager', '--video-driver', video_driver], 'persistentDrops': true}).then(function() {
 						setStatusMode('hidden');
 						initializing = false;
 					});

platform/javascript/js/engine/config.js

@@ -103,6 +103,11 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 		 * @type {Array.<string>}
 		 */
 		persistentPaths: ['/userfs'],
+		/**
+		 * @ignore
+		 * @type {boolean}
+		 */
+		persistentDrops: false,
 		/**
 		 * @ignore
 		 * @type {Array.<string>}
@@ -231,6 +236,7 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 		this.locale = parse('locale', this.locale);
 		this.canvasResizePolicy = parse('canvasResizePolicy', this.canvasResizePolicy);
 		this.persistentPaths = parse('persistentPaths', this.persistentPaths);
+		this.persistentDrops = parse('persistentDrops', this.persistentDrops);
 		this.experimentalVK = parse('experimentalVK', this.experimentalVK);
 		this.gdnativeLibs = parse('gdnativeLibs', this.gdnativeLibs);
 		this.fileSizes = parse('fileSizes', this.fileSizes);
@@ -316,6 +322,7 @@ const InternalConfig = function (initConfig) { // eslint-disable-line no-unused-
 			'canvas': this.canvas,
 			'canvasResizePolicy': this.canvasResizePolicy,
 			'locale': locale,
+			'persistentDrops': this.persistentDrops,
 			'virtualKeyboard': this.experimentalVK,
 			'onExecute': this.onExecute,
 			'onExit': function (p_code) {

platform/javascript/js/libs/library_godot_display.js

@@ -192,16 +192,29 @@ const GodotDisplayDragDrop = {
 				GodotDisplayDragDrop.promises = [];
 				GodotDisplayDragDrop.pending_files = [];
 				callback(drops);
-				const dirs = [DROP.substr(0, DROP.length - 1)];
+				if (GodotConfig.persistent_drops) {
+					// Delay removal at exit.
+					GodotOS.atexit(function (resolve, reject) {
+						GodotDisplayDragDrop.remove_drop(files, DROP);
+						resolve();
+					});
+				} else {
+					GodotDisplayDragDrop.remove_drop(files, DROP);
+				}
+			});
+		},
+
+		remove_drop: function (files, drop_path) {
+			const dirs = [drop_path.substr(0, drop_path.length - 1)];
 			// Remove temporary files
 			files.forEach(function (file) {
 				FS.unlink(file);
-					let dir = file.replace(DROP, '');
+				let dir = file.replace(drop_path, '');
 				let idx = dir.lastIndexOf('/');
 				while (idx > 0) {
 					dir = dir.substr(0, idx);
-						if (dirs.indexOf(DROP + dir) === -1) {
+					if (dirs.indexOf(drop_path + dir) === -1) {
-							dirs.push(DROP + dir);
+						dirs.push(drop_path + dir);
 					}
 					idx = dir.lastIndexOf('/');
 				}
@@ -219,7 +232,6 @@ const GodotDisplayDragDrop = {
 			}).forEach(function (dir) {
 				FS.rmdir(dir);
 			});
-			});
 		},
 
 		handler: function (callback) {

platform/javascript/js/libs/library_godot_os.js

@@ -60,6 +60,7 @@ const GodotConfig = {
 		locale: 'en',
 		canvas_resize_policy: 2, // Adaptive
 		virtual_keyboard: false,
+		persistent_drops: false,
 		on_execute: null,
 		on_exit: null,
 
@@ -68,6 +69,7 @@ const GodotConfig = {
 			GodotConfig.canvas = p_opts['canvas'];
 			GodotConfig.locale = p_opts['locale'] || GodotConfig.locale;
 			GodotConfig.virtual_keyboard = p_opts['virtualKeyboard'];
+			GodotConfig.persistent_drops = !!p_opts['persistentDrops'];
 			GodotConfig.on_execute = p_opts['onExecute'];
 			GodotConfig.on_exit = p_opts['onExit'];
 		},
@@ -80,6 +82,7 @@ const GodotConfig = {
 			GodotConfig.locale = 'en';
 			GodotConfig.canvas_resize_policy = 2;
 			GodotConfig.virtual_keyboard = false;
+			GodotConfig.persistent_drops = false;
 			GodotConfig.on_execute = null;
 			GodotConfig.on_exit = null;
 		},