Search tags case insensitive

fixes: #22352

* Added unit tests

core/js/systemtags/systemtagscollection.js

@@ -11,7 +11,7 @@
 (function(OC) {
 
 	function filterFunction(model, term) {
-		return model.get('name').substr(0, term.length) === term;
+		return model.get('name').substr(0, term.length).toLowerCase() === term.toLowerCase();
 	}
 
 	/**

core/js/tests/specs/systemtags/systemtagsinputfieldSpec.js

@@ -346,6 +346,7 @@ describe('OC.SystemTags.SystemTagsInputField tests', function() {
 					new OC.SystemTags.SystemTagModel({id: '1', name: 'abc'}),
 					new OC.SystemTags.SystemTagModel({id: '2', name: 'def'}),
 					new OC.SystemTags.SystemTagModel({id: '3', name: 'abd', userAssignable: false}),
+					new OC.SystemTags.SystemTagModel({id: '4', name: 'Deg'}),
 				]);
 			});
 			afterEach(function() {
@@ -377,6 +378,32 @@ describe('OC.SystemTags.SystemTagsInputField tests', function() {
 					}
 				]);
 			});
+			it('completes case insensitive', function() {
+				var callback = sinon.stub();
+				opts.query({
+					term: 'de',
+					callback: callback
+				});
+				expect(fetchStub.calledOnce).toEqual(true);
+
+				fetchStub.yieldTo('success', view.collection);
+
+				expect(callback.calledOnce).toEqual(true);
+				expect(callback.getCall(0).args[0].results).toEqual([
+					{
+						id: '2',
+						name: 'def',
+						userVisible: true,
+						userAssignable: true
+					},
+					{
+						id: '4',
+						name: 'Deg',
+						userVisible: true,
+						userAssignable: true
+					}
+				]);
+			});
 		});
 	});
 
@@ -446,6 +473,7 @@ describe('OC.SystemTags.SystemTagsInputField tests', function() {
 					new OC.SystemTags.SystemTagModel({id: '1', name: 'abc'}),
 					new OC.SystemTags.SystemTagModel({id: '2', name: 'def'}),
 					new OC.SystemTags.SystemTagModel({id: '3', name: 'abd', userAssignable: false}),
+					new OC.SystemTags.SystemTagModel({id: '4', name: 'Deg'}),
 				]);
 			});
 			afterEach(function() {
@@ -471,6 +499,32 @@ describe('OC.SystemTags.SystemTagsInputField tests', function() {
 					}
 				]);
 			});
+			it('completes case insensitive', function() {
+				var callback = sinon.stub();
+				opts.query({
+					term: 'de',
+					callback: callback
+				});
+				expect(fetchStub.calledOnce).toEqual(true);
+
+				fetchStub.yieldTo('success', view.collection);
+
+				expect(callback.calledOnce).toEqual(true);
+				expect(callback.getCall(0).args[0].results).toEqual([
+					{
+						id: '2',
+						name: 'def',
+						userVisible: true,
+						userAssignable: true
+					},
+					{
+						id: '4',
+						name: 'Deg',
+						userVisible: true,
+						userAssignable: true
+					}
+				]);
+			});
 		});
 	});
 });