Timeline refactor (#2175)

* Move Timeline files into their own package

* Introduce TimelineViewModel, add coroutines

* Simplify StatusViewData

* Handle timeilne fetch errors

* Rework filters, fix ViewThreadFragment

* Fix NotificationsFragment

* Simplify Notifications and Thread, handle pin

* Redo loading in TimelineViewModel

* Improve error handling in TimelineViewModel

* Rewrite actions in TimelineViewModel

* Apply feedback after timeline factoring review

* Handle initial failure in timeline correctly

app/src/main/java/com/keylesspalace/tusky/util/ViewDataUtils.kt

@@ -0,0 +1,53 @@
+@file:JvmName("ViewDataUtils")
+
+/* Copyright 2017 Andrew Dawson
+ *
+ * This file is a part of Tusky.
+ *
+ * This program is free software; you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation; either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
+ * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
+ * Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with Tusky; if not,
+ * see <http://www.gnu.org/licenses>. */
+package com.keylesspalace.tusky.util
+
+import com.keylesspalace.tusky.entity.Notification
+import com.keylesspalace.tusky.entity.Status
+import com.keylesspalace.tusky.viewdata.NotificationViewData
+import com.keylesspalace.tusky.viewdata.StatusViewData
+import com.keylesspalace.tusky.viewdata.toViewData
+import java.util.*
+
+@JvmName("statusToViewData")
+fun Status.toViewData(
+    alwaysShowSensitiveMedia: Boolean,
+    alwaysOpenSpoiler: Boolean
+): StatusViewData.Concrete {
+    val visibleStatus = this.reblog ?: this
+
+    return StatusViewData.Concrete(
+        status = this,
+        isShowingContent = alwaysShowSensitiveMedia || !visibleStatus.sensitive,
+        isCollapsible = shouldTrimStatus(visibleStatus.content),
+        isCollapsed = false,
+        isExpanded = alwaysOpenSpoiler,
+    )
+}
+
+@JvmName("notificationToViewData")
+fun Notification.toViewData(
+    alwaysShowSensitiveData: Boolean,
+    alwaysOpenSpoiler: Boolean
+): NotificationViewData.Concrete {
+    return NotificationViewData.Concrete(
+        this.type,
+        this.id,
+        this.account,
+        this.status?.toViewData(alwaysShowSensitiveData, alwaysOpenSpoiler)
+    )
+}