Fixed a promises race bug + disabled showing previous messages

src/components/InputSearch.svelte

@@ -39,7 +39,7 @@
     // the next time we open the modal, the search field will be empty
     cacheManager.addToSearchHistory('')
     dispatch('input', value)
-  }, 500)
+  }, 250)
 </script>
 
 <div class="omnisearch-input-container">

src/components/ModalVault.svelte

@@ -3,16 +3,32 @@
   import { onDestroy, onMount, tick } from 'svelte'
   import InputSearch from './InputSearch.svelte'
   import ModalContainer from './ModalContainer.svelte'
-  import { eventBus, indexingStep, IndexingStepType, type ResultNote, } from 'src/globals'
+  import {
+    eventBus,
+    indexingStep,
+    IndexingStepType,
+    type ResultNote,
+    SPACE_OR_PUNCTUATION,
+  } from 'src/globals'
   import { createNote, openNote } from 'src/tools/notes'
-  import { getCtrlKeyLabel, getExtension, isFilePDF, loopIndex, } from 'src/tools/utils'
-  import { OmnisearchInFileModal, type OmnisearchVaultModal, } from 'src/components/modals'
+  import {
+    getCtrlKeyLabel,
+    getExtension,
+    isFilePDF,
+    loopIndex,
+  } from 'src/tools/utils'
+  import {
+    OmnisearchInFileModal,
+    type OmnisearchVaultModal,
+  } from 'src/components/modals'
   import ResultItemVault from './ResultItemVault.svelte'
   import { Query } from 'src/search/query'
   import { settings } from '../settings'
   import * as NotesIndex from '../notes-index'
   import { cacheManager } from '../cache-manager'
   import { searchEngine } from 'src/search/omnisearch'
+  import CancelablePromise, { cancelable } from 'cancelable-promise'
+  import { update } from 'lodash-es'
 
   export let modal: OmnisearchVaultModal
   export let previousQuery: string | undefined
@@ -23,18 +39,30 @@
   let query: Query
   let indexingStepDesc = ''
   let searching = true
-  let refInput: InputSearch|undefined
+  let refInput: InputSearch | undefined
+
+  let pWaitingResults: CancelablePromise | null = null
 
   $: selectedNote = resultNotes[selectedIndex]
   $: searchQuery = searchQuery ?? previousQuery
   $: if (searchQuery) {
-    resultNotes = []
+    if (pWaitingResults) {
+      pWaitingResults.cancel()
+      pWaitingResults = null
+    }
     searching = true
-    updateResults().then(() => {
-      searching = false
-    }).catch((e) => {
-      console.error(e)
-    })
+    pWaitingResults = cancelable(
+      new Promise((resolve, reject) => {
+        updateResults()
+          .then(() => {
+            searching = false
+            resolve(null)
+          })
+          .catch(e => {
+            reject(e)
+          })
+      })
+    )
   } else {
     searching = false
     resultNotes = []
@@ -193,7 +221,10 @@
   function switchToInFileModal(): void {
     // Do nothing if the selectedNote is a PDF,
     // or if there is 0 match (e.g indexing in progress)
-    if (selectedNote && (isFilePDF(selectedNote?.path) || !selectedNote?.matches.length)) {
+    if (
+      selectedNote &&
+      (isFilePDF(selectedNote?.path) || !selectedNote?.matches.length)
+    ) {
       return
     }
 
@@ -232,8 +263,8 @@
 </script>
 
 <InputSearch
+  bind:this="{refInput}"
   initialValue="{searchQuery}"
-  bind:this={refInput}
   on:input="{e => (searchQuery = e.detail)}"
   placeholder="Omnisearch - Vault">
   {#if settings.showCreateButton}
@@ -258,6 +289,15 @@
   <div style="text-align: center;">
     {#if !resultNotes.length && searchQuery && !searching}
       We found 0 result for your search here.
+      {#if settings.simpleSearch && searchQuery
+          .split(SPACE_OR_PUNCTUATION)
+          .some(w => w.length < 3)}
+        <br />
+        <span style="color: var(--text-accent); font-size: small">
+          You have enabled "Simpler Search" in the settings, try to type more
+          characters.
+        </span>
+      {/if}
     {:else if searching}
       Searching...
     {/if}

src/search/omnisearch.ts

@@ -55,6 +55,7 @@ export class Omnisearch {
   private minisearch: MiniSearch
   private indexedDocuments: Map<string, number> = new Map()
   private previousResults: SearchResult[] = []
+  private previousQuery: Query | null = null
 
   constructor() {
     this.minisearch = new MiniSearch(Omnisearch.options)
@@ -154,6 +155,7 @@ export class Omnisearch {
   ): Promise<SearchResult[]> {
     if (query.isEmpty()) {
       this.previousResults = []
+      this.previousQuery = null
       return []
     }
 
@@ -172,7 +174,12 @@ export class Omnisearch {
         headings3: settings.weightH3,
       },
     })
-    if (!results.length) return this.previousResults
+
+    // If the query does not return any result,
+    // retry but with a shorter prefix limit
+    if (!results.length) {
+      return []
+    }
 
     if (options.singleFilePath) {
       return results.filter(r => r.id === options.singleFilePath)
@@ -249,6 +256,7 @@ export class Omnisearch {
       (result, index, arr) => arr.findIndex(t => t.id === result.id) === index
     )
 
+    this.previousQuery = query
     this.previousResults = results
 
     return results

src/settings.ts

@@ -210,7 +210,8 @@ export class SettingsTab extends PluginSettingTab {
     new Setting(containerEl)
       .setName('Simpler search')
       .setDesc(
-        `Enable this if Obsidian often freezes while making searches. This may return fewer results.`
+        `Enable this if Obsidian often freezes while making searches.
+        Words shorter than 3 characters won't be used as prefixes; this can reduce search delay but will return fewer results.`
       )
       .addToggle(toggle =>
         toggle.setValue(settings.simpleSearch).onChange(async v => {