Use custom view to handle manga info cover size (fixes #3354)

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/MangaCoverImageView.kt

@@ -0,0 +1,24 @@
+package eu.kanade.tachiyomi.ui.manga.chapter
+
+import android.content.Context
+import android.util.AttributeSet
+import androidx.appcompat.widget.AppCompatImageView
+import kotlin.math.min
+
+/**
+ * A custom ImageView for holding a manga cover with:
+ * - width: min(maxWidth attr, 33% of parent width)
+ * - height: 2:3 width:height ratio
+ *
+ * Should be defined with a width of match_parent.
+ */
+class MangaCoverImageView(context: Context, attrs: AttributeSet?) : AppCompatImageView(context, attrs) {
+
+    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
+        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
+
+        val width = min(maxWidth, measuredWidth / 3)
+        val height = width / 2 * 3
+        setMeasuredDimension(width, height)
+    }
+}