implemented autocomplete for filter in kanban

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/project/Kanban.svelte

@@ -2,11 +2,12 @@
     import { onDestroy, onMount } from 'svelte';
     import { useTinyRouter } from 'svelte-tiny-router';
 
-    import { api, patch, post, eventStream, target } from '../../urls.svelte.js';
+    import { api, get, patch, post, eventStream, target } from '../../urls.svelte.js';
     import { error, messages, yikes }  from '../../warn.svelte';
     import { t }             from '../../translations.svelte.js';
     import { user }          from '../../user.svelte.js';
 
+    import Autocomplete      from '../../Components/Autocomplete.svelte';
     import Card              from './KanbanCard.svelte';
     import LineEditor        from '../../Components/LineEditor.svelte';
     import MarkdownEditor    from '../../Components/MarkdownEditor.svelte';
@@ -16,12 +17,12 @@
     let connectionStatus = 'disconnected';
     let { id }           = $props();
     let descr            = $state(false);
-    let filter_input     = $state('');
+    let filter_input     = $state({display:''});
     let router           = useTinyRouter();
-    if (router.hasQueryParam('filter')) filter_input = router.getQueryParam('filter');
+    if (router.hasQueryParam('filter')) filter_input = {display:router.getQueryParam('filter')};
     let dragged      = null;
     let highlight    = $state({});
-    let filter       = $derived(filter_input.toLowerCase());
+    let filter       = $derived(filter_input.display.toLowerCase());
     let project      = $state(null);
     let tasks        = $state({});
     let users        = [];
@@ -29,7 +30,7 @@
     let info         = $state(null);
     let task_form    = $state(false);
     let stateList = {};
-    $effect(() => updateUrl(filter_input));
+    $effect(() => updateUrl(filter_input.display));
 
     function byName(a,b) {
         return a.name.localeCompare(b.name);
@@ -92,6 +93,17 @@
         }
     }
 
+    async function getCandidates(input){
+        if (!input || input.length <3) return [];
+        const url = api(`tags/search/${encodeURI(input)}`);
+        const res = await get(url);
+        if (res.ok){
+            yikes();
+            const list = await res.json();
+            return list.map(elem => {return {display:elem}});
+        } else error(res);
+    }
+
     function handleCreateEvent(evt){
         handleEvent(evt,'create');
     }
@@ -191,6 +203,10 @@
         }
     }
 
+    function onCommit(){
+        return false;
+    }
+
     function openTask(task_id){
         window.open(`/task/${task_id}/view`, '_blank').focus();
     }
@@ -219,8 +235,8 @@
         const user_ids = Object.values(project.members).map(member => member.user.id);
         const data = {
             url     : location.href,
-            tags    : ['Kanban', project.name, filter_input],
-            comment : `${project.name}: ${filter_input}`,
+            tags    : ['Kanban', project.name, filter_input.display],
+            comment : `${project.name}: ${filter_input.display}`,
             share   : user_ids
         }
         const url  = api('bookmark');
@@ -239,7 +255,7 @@
 
     function updateUrl(){
         let url = window.location.origin + window.location.pathname;
-        if (filter_input) url += '?filter=' + encodeURI(filter_input);
+        if (filter_input.display) url += '?filter=' + encodeURI(filter_input.display);
         window.history.replaceState(window.history.state, '', url);
     }
 
@@ -272,7 +288,7 @@
 </fieldset>
 <div class="kanban" style="display: grid; grid-template-columns: {`repeat(${columns}, auto)`}">
     <span class="filter">
-        <input type="text" bind:value={filter_input} autofocus />
+        <Autocomplete {getCandidates} bind:candidate={filter_input} {onCommit} autofocus={true} />
         {t('filter')}
         <button style="visibility:{filter_input ? 'visible' : 'hidden'}" onclick={save_bookmark}>
             <span class="symbol"></span> {t('save_object',{object:t('bookmark')})}