vault: Write up learnings on startup-behaviour with custom searches

This allows

Co-Authored-By: Michael Naumov <[email protected]>

resources/sample_vaults/Tasks-Demo/Functions/Reusable Code in Custom Filters.md

@@ -2,6 +2,8 @@
 
 ## Custom JS way
 
+These depend on the `customJS` variable being initialised, which is not always true if this file is loaded in Reading mode during startup.
+
 ```tasks
 group by function \
     const {Tasks} = customJS; \
@@ -14,8 +16,14 @@ group by function customJS.Tasks.byParentItemDescription(task);
 limit 1
 ```
 
+See earlier discussion:
+
+See <https://github.com/obsidian-tasks-group/obsidian-tasks/issues/3024#issuecomment-2285073838>.
+
 ## CodeScript Toolkit way
 
+### Searches which always work if this file is loaded in Reading mode during startup
+
 ```tasks
 group by function \
     const {parentDescription} = require('/Tasks.js'); \
@@ -28,6 +36,8 @@ group by function require('/Tasks.js').parentDescription(task)
 limit 1
 ```
 
+### Searches usually work if this file is loaded in Reading mode during startup, and Tasks has been patched
+
 ```tasks
 group by function Tasks.parentDescription(task)
 limit 1
@@ -37,3 +47,38 @@ limit 1
 group by function TasksNew.parentDescription(task)
 limit 1
 ```
+
+These did not initially work if this file is loaded in Reading mode during startup - because they depend on `Tasks` and `TasksNew` being initialised by the "CodeScript Toolkit" [startup script](https://github.com/mnaoumov/obsidian-codescript-toolkit?tab=readme-ov-file#startup-script), which is not always true if this code block is loaded in Reading mode during startup.
+
+By use of [onLayoutReady()](https://docs.obsidian.md/Reference/TypeScript+API/Workspace/onLayoutReady) in Tasks main, it made this code even during startup...
+
+This is the diff:
+
+```diff
+Index: src/main.ts
+IDEA additional info:
+Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
+<+>UTF-8
+===================================================================
+diff --git a/src/main.ts b/src/main.ts
+--- a/src/main.ts (revision 2493c6635db11d94379429fbed88c14323c5a7ff)
++++ b/src/main.ts (revision 00edbe4eb1283fd22a3226ea9587ad3d8ec0da98)
+@@ -55,8 +55,14 @@
+             workspace: this.app.workspace,
+             events,
+         });
+-        this.inlineRenderer = new InlineRenderer({ plugin: this });
+-        this.queryRenderer = new QueryRenderer({ plugin: this, events });
++
++        this.app.workspace.onLayoutReady(() => {
++            // Only execute searches once all plugins are loaded.
++            // This fixed use of a "CodeScript Toolkit" startup script inside
++            // notes that were already open in Reading mode when Obsdian was starting up.
++            this.inlineRenderer = new InlineRenderer({ plugin: this });
++            this.queryRenderer = new QueryRenderer({ plugin: this, events });
++        });
+
+         this.registerEditorExtension(newLivePreviewExtension());
+         this.registerEditorSuggest(new EditorSuggestor(this.app, getSettings(), this));
+
+```