fix(filters): do not match partial labels

This change fixes a bug where an input query like "labels in test || labels in l" would be replaced with something like "undefinedabels in test || labels in l" or "3abels in test || labels in l" when there was a label starting with "l" - when it should not have touched that.
The matching was changed so that only exact label matches are taken into account when searching for labels.

Now, the above string would be replaced by "labels in 1 || labels in l" (when the label "test" has the id 1).

Maybe resolves https://community.vikunja.io/t/filtering-by-label-ux-issues/2393/8

frontend/src/components/project/partials/FilterInput.vue

@@ -84,6 +84,10 @@ function unEscapeHtml(unsafe: string): string {
 }
 
 const highlightedFilterQuery = computed(() => {
+	if (filterQuery.value === '') {
+		return ''
+	}
+
 	let highlighted = escapeHtml(filterQuery.value)
 	DATE_FIELDS
 		.forEach(o => {
@@ -94,7 +98,7 @@ const highlightedFilterQuery = computed(() => {
 				}
 
 				let endPadding = ''
-				if(value.endsWith(' ')) {
+				if (value.endsWith(' ')) {
 					const fullLength = value.length
 					value = value.trimEnd()
 					const numberOfRemovedSpaces = fullLength - value.length
@@ -208,36 +212,38 @@ function handleFieldInput() {
 		const pattern = new RegExp('(' + field + '\\s*' + FILTER_OPERATORS_REGEX + '\\s*)([\'"]?)([^\'"&|()]+\\1?)?$', 'ig')
 		const match = pattern.exec(textUpToCursor)
 
-		if (match !== null) {
-			// eslint-disable-next-line @typescript-eslint/no-unused-vars
-			const [matched, prefix, operator, space, keyword] = match
-			if (keyword) {
-				let search = keyword
-				if (operator === 'in' || operator === '?=') {
-					const keywords = keyword.split(',')
-					search = keywords[keywords.length - 1].trim()
-				}
-				if (matched.startsWith('label')) {
-					autocompleteResultType.value = 'labels'
-					autocompleteResults.value = labelStore.filterLabelsByQuery([], search)
-				}
-				if (matched.startsWith('assignee')) {
-					autocompleteResultType.value = 'assignees'
-					if (projectId) {
-						projectUserService.getAll({projectId}, {s: search})
-							.then(users => autocompleteResults.value = users.length > 1 ? users : [])
-					} else {
-						userService.getAll({}, {s: search})
-							.then(users => autocompleteResults.value = users.length > 1 ? users : [])
-					}
-				}
-				if (!projectId && matched.startsWith('project')) {
-					autocompleteResultType.value = 'projects'
-					autocompleteResults.value = projectStore.searchProject(search)
-				}
-				autocompleteMatchText.value = keyword
-				autocompleteMatchPosition.value = match.index + prefix.length - 1 + keyword.replace(search, '').length
+		if (match === null) {
+			return
+		}
+
+		// eslint-disable-next-line @typescript-eslint/no-unused-vars
+		const [matched, prefix, operator, space, keyword] = match
+		if (keyword) {
+			let search = keyword
+			if (operator === 'in' || operator === '?=') {
+				const keywords = keyword.split(',')
+				search = keywords[keywords.length - 1].trim()
 			}
+			if (matched.startsWith('label')) {
+				autocompleteResultType.value = 'labels'
+				autocompleteResults.value = labelStore.filterLabelsByQuery([], search)
+			}
+			if (matched.startsWith('assignee')) {
+				autocompleteResultType.value = 'assignees'
+				if (projectId) {
+					projectUserService.getAll({projectId}, {s: search})
+						.then(users => autocompleteResults.value = users.length > 1 ? users : [])
+				} else {
+					userService.getAll({}, {s: search})
+						.then(users => autocompleteResults.value = users.length > 1 ? users : [])
+				}
+			}
+			if (!projectId && matched.startsWith('project')) {
+				autocompleteResultType.value = 'projects'
+				autocompleteResults.value = projectStore.searchProject(search)
+			}
+			autocompleteMatchText.value = keyword
+			autocompleteMatchPosition.value = match.index + prefix.length - 1 + keyword.replace(search, '').length
 		}
 	})
 }
@@ -259,7 +265,7 @@ const blurDebounced = useDebounceFn(() => emit('blur'), 500)
 
 <template>
 	<div class="field">
-		<label 
+		<label
 			class="label"
 			:for="id"
 		>
@@ -326,11 +332,11 @@ const blurDebounced = useDebounceFn(() => emit('blur'), 500)
 
 <style lang="scss">
 .filter-input-highlight {
-	
+
 	&, button.filter-query__date_value {
 		color: var(--card-color);
 	}
-	
+
 	span {
 		&.filter-query__field {
 			color: var(--code-literal);

frontend/src/components/project/partials/Filters.vue

@@ -97,6 +97,9 @@ watch(
 	},
 )
 
+const labelStore = useLabelStore()
+const projectStore = useProjectStore()
+
 // Using watchDebounced to prevent the filter re-triggering itself.
 watch(
 	() => modelValue,
@@ -112,13 +115,10 @@ watch(
 	{immediate: true},
 )
 
-const labelStore = useLabelStore()
-const projectStore = useProjectStore()
-
 function change() {
 	const filter = transformFilterStringForApi(
 		filterQuery.value,
-		labelTitle => labelStore.filterLabelsByQuery([], labelTitle)[0]?.id || null,
+		labelTitle => labelStore.getLabelByExactTitle(labelTitle)?.id || null,
 		projectTitle => {
 			const found = projectStore.findProjectByExactname(projectTitle)
 			return found?.id || null

frontend/src/helpers/filters.test.ts

@@ -127,6 +127,16 @@ describe('Filter Transformation', () => {
 			
 			expect(transformed).toBe('due_date = now/d || due_date > now/w+1w')
 		})
+		
+		it('should only transform one label occurrence at a time', () => {
+			const transformed = transformFilterStringForApi(
+				'labels in ipsum || labels in l',
+				multipleDummyResolver,
+				nullTitleToIdResolver,
+			)
+
+			expect(transformed).toBe('labels in 2 || labels in l')
+		})
 	})
 
 	describe('To API', () => {