{
	"id": "176327",
	"key": "TIMOB-28573",
	"fields": {
		"issuetype": {
			"id": "1",
			"description": "A problem which impairs or prevents the functions of the product.",
			"name": "Bug",
			"subtask": false
		},
		"project": {
			"id": "10153",
			"key": "TIMOB",
			"name": "Titanium SDK/CLI",
			"projectCategory": {
				"id": "10100",
				"description": "Titanium and related SDKs used in application development",
				"name": "Client"
			}
		},
		"fixVersions": [
			{
				"id": "21265",
				"description": "",
				"name": "Release 10.1.1",
				"archived": false,
				"released": true,
				"releaseDate": "2021-11-19"
			}
		],
		"resolution": {
			"id": "1",
			"description": "A fix for this issue is checked into the tree and tested.",
			"name": "Fixed"
		},
		"resolutiondate": "2021-11-03T01:04:49.000+0000",
		"created": "2021-11-02T23:25:23.000+0000",
		"priority": {
			"name": "High",
			"id": "2"
		},
		"labels": [
			"ListView",
			"android",
			"performance",
			"regression"
		],
		"versions": [
			{
				"id": "21052",
				"description": "",
				"name": "Release 9.3.0",
				"archived": false,
				"released": true,
				"releaseDate": "2020-12-14"
			}
		],
		"issuelinks": [],
		"assignee": {
			"name": "jquick",
			"key": "jquick",
			"displayName": "Joshua Quick",
			"active": true,
			"timeZone": "America/Los_Angeles"
		},
		"updated": "2021-11-17T10:58:55.000+0000",
		"status": {
			"description": "The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.",
			"name": "Closed",
			"id": "6",
			"statusCategory": {
				"id": 3,
				"key": "done",
				"colorName": "green",
				"name": "Done"
			}
		},
		"components": [
			{
				"id": "10202",
				"name": "Android",
				"description": "Android Platform"
			}
		],
		"description": "*Summary:*\r\nAs of Titanium 9.3.0, list items added to a {{ListView}} after the window has opened can cause a huge scroll performance issue. This is only noticeable if the list item templates contain a lot of child views, such as 16 or more. This is not an issue if items are added before the window has opened.\r\n\r\n*Note:*\r\nThis is an issue with {{TableView}} as well.\r\n\r\n*Steps to reproduce:*\r\n# Build and run  [^ListViewTemplateManyViewsTest.js] on Android.\r\n# Fling the {{ListView}} down.\r\n# Notice how bad the scrolling stutters.\r\n\r\n*Cause:*\r\nAll Titanium proxy objects are assigned the root activity by default, which is the splash screen window.\r\nhttps://github.com/appcelerator/titanium_mobile/blob/master/android/titanium/src/java/org/appcelerator/kroll/KrollProxy.java#L173\r\n\r\nThe issue with this is that {{ListView}} will notice that the {{ListItem}}'s activity does not match the activity the {{ListView}} is attached to and will *+correctly+* update the {{ListItem}}'s activity and release its old views. This behavior is correct because the item needs to use the same theme as the {{ListView}}, but the item should favor the top-most activity and not the root activity when created.\r\nhttps://github.com/appcelerator/titanium_mobile/blob/master/android/modules/ui/src/java/ti/modules/titanium/ui/widget/listview/ListViewHolder.java#L165-L168\r\n\r\n*Work-Around:*\r\nAdd the items before the window opens, such as during {{ListView}} or {{ListSection}} creation.\r\n",
		"attachment": [
			{
				"id": "68023",
				"filename": "ListViewTemplateManyViewsTest.js",
				"author": {
					"name": "jquick",
					"key": "jquick",
					"displayName": "Joshua Quick",
					"active": true,
					"timeZone": "America/Los_Angeles"
				},
				"created": "2021-11-02T23:23:51.000+0000",
				"size": 1976,
				"mimeType": "application/x-javascript"
			}
		],
		"flagged": false,
		"summary": "Android: Complex items added to ListView after window open can cause scroll performance issues as of 9.3.0",
		"creator": {
			"name": "jquick",
			"key": "jquick",
			"displayName": "Joshua Quick",
			"active": true,
			"timeZone": "America/Los_Angeles"
		},
		"subtasks": [],
		"reporter": {
			"name": "jquick",
			"key": "jquick",
			"displayName": "Joshua Quick",
			"active": true,
			"timeZone": "America/Los_Angeles"
		},
		"environment": null,
		"comment": {
			"comments": [
				{
					"id": "459152",
					"author": {
						"name": "jquick",
						"key": "jquick",
						"displayName": "Joshua Quick",
						"active": true,
						"timeZone": "America/Los_Angeles"
					},
					"body": "PR (master): https://github.com/appcelerator/titanium_mobile/pull/13163",
					"updateAuthor": {
						"name": "jquick",
						"key": "jquick",
						"displayName": "Joshua Quick",
						"active": true,
						"timeZone": "America/Los_Angeles"
					},
					"created": "2021-11-02T23:43:12.000+0000",
					"updated": "2021-11-02T23:43:12.000+0000"
				},
				{
					"id": "459172",
					"author": {
						"name": "eharris",
						"key": "eharris",
						"displayName": "Ewan Harris",
						"active": true,
						"timeZone": "Europe/Dublin"
					},
					"body": "Backport PR: https://github.com/appcelerator/titanium_mobile/pull/13183",
					"updateAuthor": {
						"name": "eharris",
						"key": "eharris",
						"displayName": "Ewan Harris",
						"active": true,
						"timeZone": "Europe/Dublin"
					},
					"created": "2021-11-17T10:58:55.000+0000",
					"updated": "2021-11-17T10:58:55.000+0000"
				}
			],
			"maxResults": 2,
			"total": 2,
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		}
	}
}