Fix various lint warnings (#4409)

- Remove empty file `ExampleInstrumentedTest.java`.
- Replace deprecated `MigrationTestHelper` constructor call.
- Add reified inline extension methods for `Bundle` and `Intent` to
retrieve `Parcelable` and `Serializable` objects by calling the core
`BundleCompat` and `IntentCompat` methods, to allow shorter syntax and
removing the need to pass the class explicitly.
- Replace deprecated `drawable.setColorFilter()` with simpler
`drawable.setTint()` (uses blend mode `SRC_IN` by default, has the same
effect as `SRC_ATOP` when the source is a color).
- Rename shadowed variables (mostly caught exceptions).
- Remove unnecessary `.orEmpty()` on non-null fields.
- Replace `.size() == 0` with `.isEmpty()`.
- Prevent `NullPointerException` when `account.getDisplayName()` is
`null` in `StatusBaseViewHolder.setDisplayName()`.
- Declare `customEmojis` argument as non-null in
`StatusBaseViewHolder.setDisplayName()` because it calls
`CustomEmojiHelper.emojify()` which now requires it to be non-null.
- Prevent `NullPointerException` when no matching filter is found in
`StatusBaseViewHolder.setupFilterPlaceholder()`.
- Remove deprecated call to `setTargetFragment()` (target fragment is
not used anyway).
- Remove deprecated call to `isUserVisibleHint()` and test if the view
has been destroyed instead.
- Remove some unused imports.
- Remove unnecessary casts.
- Rename arguments to supertype names when a warning is shown.
- Prevent a potential memory leak by clearing the
`toolbarVisibilityDisposable` reference in `onDestroyView()`.

app/src/main/java/com/keylesspalace/tusky/fragment/ViewImageFragment.kt

@@ -28,7 +28,6 @@ import android.view.MotionEvent
 import android.view.View
 import android.view.ViewGroup
 import android.widget.ImageView
-import androidx.core.os.BundleCompat
 import androidx.lifecycle.lifecycleScope
 import com.bumptech.glide.Glide
 import com.bumptech.glide.load.DataSource
@@ -39,6 +38,7 @@ import com.keylesspalace.tusky.R
 import com.keylesspalace.tusky.ViewMediaActivity
 import com.keylesspalace.tusky.databinding.FragmentViewImageBinding
 import com.keylesspalace.tusky.entity.Attachment
+import com.keylesspalace.tusky.util.getParcelableCompat
 import com.keylesspalace.tusky.util.hide
 import com.keylesspalace.tusky.util.viewBinding
 import com.keylesspalace.tusky.util.visible
@@ -100,12 +100,8 @@ class ViewImageFragment : ViewMediaFragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
-        val arguments = this.requireArguments()
-        val attachment = BundleCompat.getParcelable(
-            arguments,
-            ARG_ATTACHMENT,
-            Attachment::class.java
-        )
+        val arguments = requireArguments()
+        val attachment = arguments.getParcelableCompat<Attachment>(ARG_ATTACHMENT)
         this.shouldStartTransition = arguments.getBoolean(ARG_START_POSTPONED_TRANSITION)
         val url: String?
         var description: String? = null
@@ -231,7 +227,7 @@ class ViewImageFragment : ViewMediaFragment() {
     }
 
     override fun onToolbarVisibilityChange(visible: Boolean) {
-        if (!userVisibleHint) return
+        if (view == null) return
 
         isDescriptionVisible = showingDescription && visible
         val alpha = if (isDescriptionVisible) 1.0f else 0.0f

app/src/main/java/com/keylesspalace/tusky/fragment/ViewMediaFragment.kt

@@ -100,6 +100,7 @@ abstract class ViewMediaFragment : Fragment() {
 
     override fun onDestroyView() {
         toolbarVisibilityDisposable?.invoke()
+        toolbarVisibilityDisposable = null
         super.onDestroyView()
     }
 }

app/src/main/java/com/keylesspalace/tusky/fragment/ViewVideoFragment.kt

@@ -52,6 +52,7 @@ import com.keylesspalace.tusky.ViewMediaActivity
 import com.keylesspalace.tusky.databinding.FragmentViewVideoBinding
 import com.keylesspalace.tusky.di.Injectable
 import com.keylesspalace.tusky.entity.Attachment
+import com.keylesspalace.tusky.util.getParcelableCompat
 import com.keylesspalace.tusky.util.hide
 import com.keylesspalace.tusky.util.viewBinding
 import com.keylesspalace.tusky.util.visible
@@ -130,7 +131,7 @@ class ViewVideoFragment : ViewMediaFragment(), Injectable {
     @SuppressLint("ClickableViewAccessibility")
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
-        val attachment = arguments?.getParcelable<Attachment>(ARG_ATTACHMENT)
+        val attachment = arguments?.getParcelableCompat<Attachment>(ARG_ATTACHMENT)
             ?: throw IllegalArgumentException("attachment has to be set")
 
         val url = attachment.url
@@ -377,7 +378,7 @@ class ViewVideoFragment : ViewMediaFragment(), Injectable {
     }
 
     override fun onToolbarVisibilityChange(visible: Boolean) {
-        if (!userVisibleHint) {
+        if (view == null) {
             return
         }