bug fix orphaned models and graphical tray glitch

- ensure models are disposed correctly
- clean up any orphaned models left after editor:close
- improve concurrent multiple instances javascript models
- fix graphical glitch

packages/node_modules/@node-red/editor-client/src/js/ui/editors/code-editors/monaco.js

@@ -99,6 +99,20 @@ RED.editor.codeEditor.monaco = (function() {
 
     const modulesCache = {};
     
+    RED.events.on("editor:close",function() { 
+        //catch all - when editor is closed, ensure lod models that are not explicitly destroyed by a call to .destroy() are dumped
+        let models = monaco.editor.getModels();
+        if(models && models.length) {
+            console.warn("Cleaning up monaco models left behind. Any node that calls createEditor() should call .destroy().")
+            for (let index = 0; index < models.length; index++) {
+                const model = models[index];
+                if(!model.isDisposed()) {
+                    model.dispose();
+                }
+            }
+        }
+    });
+
     /**
      * Helper function to load/reload types.
      * @param {string} mod - type lib to load. Only known libs are currently supported.
@@ -681,7 +695,7 @@ RED.editor.codeEditor.monaco = (function() {
 
         var editorSettings = RED.editor.codeEditor.settings || {};
         var loadedLibs = {JS:{}, TS:{}};//for tracking and later disposing of loaded type libs
-        var watchTimer, elVisible, elVisibleMem;
+        var watchTimer;
         var createThemeMenuOption = function (theme, keybinding) {
             return {
                 // An unique identifier of the contributed action.
@@ -708,7 +722,7 @@ RED.editor.codeEditor.monaco = (function() {
             if (mode) {
                 mode = mode.replace("ace/mode/", "");
             } else {
-                mode = "javascript";
+                mode = "text";
             }
             switch (mode) {
                 case "nrjavascript":
@@ -764,6 +778,7 @@ RED.editor.codeEditor.monaco = (function() {
         if (editorOptions.lineNumbers === false) { editorOptions.lineNumbers = false; }
         if (editorOptions.theme == null) { editorOptions.theme = monacoThemes[0]; }
         if (editorOptions.mode == null) { editorOptions.mode = convertAceModeToMonacoLang(options.mode); }
+        if (editorOptions.automaticLayout == null) { editorOptions.automaticLayout = true; }
 
         if (options.foldStyle) {
             switch (options.foldStyle) {
@@ -917,13 +932,8 @@ RED.editor.codeEditor.monaco = (function() {
         ed.session = ed;
         ed.renderer = {};
 
-        ed.setMode = function(mode, cb) {
+        ed.setMode = function(mode, cb, resize) {
-            if (mode && typeof mode === "object") {
+            if(resize==null) { resize = true; }
-                var options = mode;
-                mode = options.path;
-            } else {
-                mode = mode || "text";
-            }
             mode = convertAceModeToMonacoLang(mode);
             var oldModel = ed.getModel();
             var oldValue = ed.getValue();
@@ -935,9 +945,10 @@ RED.editor.codeEditor.monaco = (function() {
                 var oldSelections = ed.getSelections();
                 var oldPosition = ed.getPosition();
                 oldValue = oldModel.getValue() || "";
+                if(!oldModel.isDisposed()) { oldModel.dispose(); }
+                ed.setModel(null);
                 newModel = monaco.editor.createModel((oldValue || ""), mode);
                 ed.setModel(newModel);
-                oldModel.dispose();
                 ed.setScrollTop(oldScrollTop, 1/* immediate */);
                 ed.setScrollLeft(oldScrollLeft, 1/* immediate */);
                 ed.setPosition(oldPosition);
@@ -949,7 +960,9 @@ RED.editor.codeEditor.monaco = (function() {
             if (cb && typeof cb == "function") {
                 cb();
             }
-            this.resize();//cause a call to layout()
+            if(resize) { 
+                this.resize(); //cause a call to layout()
+            }
         }
 
         ed.getRange = function getRange(){
@@ -1032,7 +1045,9 @@ RED.editor.codeEditor.monaco = (function() {
             } catch (error) { }
             try {
                 var m = this.getModel();
-                m.dispose();
+                if(m && !m.isDisposed()) {
+                    m.dispose();
+                }
                 this.setModel(null);
             } catch (e) { }
 
@@ -1182,41 +1197,19 @@ RED.editor.codeEditor.monaco = (function() {
 
         //as models are signleton, consts and let are avialable to other javascript instances 
         //so when not focused, set editor mode to text temporarily to avoid multiple defs
+        
+        
         ed.onDidBlurEditorWidget(function() {
             if(isVisible(el) == false) {
-                if(ed._mode == "javascript") {
+                onVisibilityChange(false);
-                    ed.setMode('text');
-                    ed._tempMode = "text"; 
-                }                
             }
         });
 
         ed.onDidFocusEditorWidget(function() {
-            if(ed._mode == "javascript" && ed._tempMode == "text") {
+            onVisibilityChange(true, 10);
-                ed._tempMode = ""; 
-                setTimeout(function() {
-                    ed.setMode('javascript');
-                }, 5);
-            }
         });
 
-        watchVisibility(el, function(visible, element) {
+        function visibilityWatcher(element, callback) {
-            if(visible) {
-                if(ed._mode == "javascript" && ed._tempMode == "text") {
-                    ed._tempMode = ""; 
-                    setTimeout(function() {
-                        ed.setMode('javascript');
-                    }, 5);
-                }
-            } else {
-                if(ed._mode == "javascript") {
-                    ed.setMode('text');
-                    ed._tempMode = "text"; 
-                }      
-            }
-        });
-        
-        function watchVisibility(element, callback) {
             try {
                 var options = {
                     root: $(element).closest("div.red-ui-tray-content")[0] || document,
@@ -1225,32 +1218,51 @@ RED.editor.codeEditor.monaco = (function() {
                 };
                 var observer = new IntersectionObserver(function(entries, observer) {
                     entries.forEach(function(entry) {
-                        callback(entry.intersectionRatio > 0, entry);
+                        callback(entry.intersectionRatio > 0, 5, entry);
                     });
                 }, options);
                 observer.observe(element); 
             } catch (e1) {
-                //browser not supporting IntersectionObserver?
+                //browser not supporting IntersectionObserver? then fall back to polling!
-                //fall back to polling
                 try {
+                    let elVisibleMem = isVisible(el)
                     watchTimer = setInterval(function() {
-                        elVisible = isVisible(el);
+                        let elVisible = isVisible(el);
                         if(elVisible != elVisibleMem) {
-                            callback(elVisible, element);
+                            callback(elVisible, 100, element);
                         }
-                        elVisible = elVisibleMem;
+                        elVisibleMem = elVisible;
-                    }, 200);
+                    }, 100);
                 } catch (e2) { }
             }
-            
         }
 
+        function onVisibilityChange(visible, delay, element) {
+            if(visible) {
+                if(ed._mode == "javascript" && ed._tempMode == "text") {
+                    ed._tempMode = ""; 
+                    setTimeout(function() {
+                        if(el.parentElement) { //ensure el is still in DOM
+                            ed.setMode('javascript', undefined, false);
+                        }
+                    }, delay);
+                }
+            } else if(ed._mode == "javascript") {
+                if(el.parentElement) { //ensure el is still in DOM
+                    ed.setMode('text', undefined, false);
+                    ed._tempMode = "text"; 
+                }
+            }
+        }
+
+        visibilityWatcher(el, onVisibilityChange);
+
         //by default, set javascript editors to text mode.
         //when elemt becomes visible, it will be (re) set to javascript mode
         //this is to ensure multiple editors sharing the model dont presnet its 
         //consts & lets to each other
         if(ed._mode == "javascript") {
-            ed.setMode('text');
+            ed.setMode('text', undefined, false);
             ed._tempMode = "text"; 
         }