prevent MainActivity from leaking through the DrawerImageLoader singleton (#4153)

Another fix for a memory leak. This one is not as big as #4150, but
still worth fixing for memory constrained devices imo.
The `DrawerImageLoader` implementation (a global singleton) references a
member of the `MainActivity`, causing the whole activity to leak.

This weird construct was introduced in #1989 to fix a crash, but I think
since we migrated to coroutines it is no longer necessary because all
calls get correctly cancelled. I tried reproducing the crash but could
not, so I'm pretty sure it is fine. I would appreciate it if someone
else could try it as well though.

(The crash could be reproduced on slow internet, when
`onFetchUserInfoSuccess` was called while the activity was being
destroyed, causing Glide to crash the app because it can't use destroyed
activities. `onFetchUserInfoSuccess` is now no longer called in this
case because it is inside a `lifecycleScope.launch` block.)

app/src/main/java/com/keylesspalace/tusky/MainActivity.kt

@@ -56,7 +56,6 @@ import androidx.preference.PreferenceManager
 import androidx.viewpager2.widget.MarginPageTransformer
 import at.connyduck.calladapter.networkresult.fold
 import com.bumptech.glide.Glide
-import com.bumptech.glide.RequestManager
 import com.bumptech.glide.load.resource.bitmap.RoundedCorners
 import com.bumptech.glide.request.target.CustomTarget
 import com.bumptech.glide.request.target.FixedSizeDrawable
@@ -174,8 +173,6 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
 
     private val preferences by unsafeLazy { PreferenceManager.getDefaultSharedPreferences(this) }
 
-    private lateinit var glide: RequestManager
-
     // We need to know if the emoji pack has been changed
     private var selectedEmojiPack: String? = null
 
@@ -187,7 +184,6 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
 
     private var directMessageTab: TabLayout.Tab? = null
 
-    @Suppress("DEPRECATION")
     @SuppressLint("RestrictedApi")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -266,8 +262,6 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
         window.statusBarColor = Color.TRANSPARENT // don't draw a status bar, the DrawerLayout and the MaterialDrawerLayout have their own
         setContentView(binding.root)
 
-        glide = Glide.with(this)
-
         binding.composeButton.setOnClickListener {
             val composeIntent = Intent(applicationContext, ComposeActivity::class.java)
             startActivity(composeIntent)
@@ -562,11 +556,13 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
         DrawerImageLoader.init(object : AbstractDrawerImageLoader() {
             override fun set(imageView: ImageView, uri: Uri, placeholder: Drawable, tag: String?) {
                 if (animateAvatars) {
-                    glide.load(uri)
+                    Glide.with(imageView)
+                        .load(uri)
                         .placeholder(placeholder)
                         .into(imageView)
                 } else {
-                    glide.asBitmap()
+                    Glide.with(imageView)
+                        .asBitmap()
                         .load(uri)
                         .placeholder(placeholder)
                         .into(imageView)
@@ -574,7 +570,7 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
             }
 
             override fun cancel(imageView: ImageView) {
-                glide.clear(imageView)
+                Glide.with(imageView).clear(imageView)
             }
 
             override fun placeholder(ctx: Context, tag: String?): Drawable {
@@ -979,7 +975,8 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
     }
 
     private fun onFetchUserInfoSuccess(me: Account) {
-        glide.asBitmap()
+        Glide.with(header.accountHeaderBackground)
+            .asBitmap()
             .load(me.header)
             .into(header.accountHeaderBackground)
 
@@ -1021,7 +1018,10 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
         val navIconSize = resources.getDimensionPixelSize(R.dimen.avatar_toolbar_nav_icon_size)
 
         if (animateAvatars) {
-            glide.asDrawable().load(avatarUrl).transform(RoundedCorners(resources.getDimensionPixelSize(R.dimen.avatar_radius_36dp)))
+            Glide.with(this)
+                .asDrawable()
+                .load(avatarUrl)
+                .transform(RoundedCorners(resources.getDimensionPixelSize(R.dimen.avatar_radius_36dp)))
                 .apply {
                     if (showPlaceholder) placeholder(R.drawable.avatar_default)
                 }
@@ -1048,7 +1048,10 @@ class MainActivity : BottomSheetActivity(), ActionButtonActivity, HasAndroidInje
                     }
                 })
         } else {
-            glide.asBitmap().load(avatarUrl).transform(RoundedCorners(resources.getDimensionPixelSize(R.dimen.avatar_radius_36dp)))
+            Glide.with(this)
+                .asBitmap()
+                .load(avatarUrl)
+                .transform(RoundedCorners(resources.getDimensionPixelSize(R.dimen.avatar_radius_36dp)))
                 .apply {
                     if (showPlaceholder) placeholder(R.drawable.avatar_default)
                 }