Navigate to pan / landscape zoom (#6481)

* pan if the image is zoomed instead of navigating away
quickly display full landscape image before zooming to fit height in fit to screen

* add Tap to pan preference, defaults to true
add landscape zoom preference, defaults to false

* hide landscape image zoom option if scale is not fit screen

* fix landscape image zoom for first image and loading image

* properly reload pagerholders when landscape zoom option is changed

* enable landscape zoom by default

app/src/main/java/eu/kanade/tachiyomi/util/view/ViewExtensions.kt

@@ -4,7 +4,9 @@ package eu.kanade.tachiyomi.util.view
 
 import android.annotation.SuppressLint
 import android.content.Context
+import android.content.res.Resources
 import android.graphics.Point
+import android.graphics.Rect
 import android.graphics.drawable.Drawable
 import android.text.TextUtils
 import android.view.Gravity
@@ -259,3 +261,16 @@ inline fun <reified T : Drawable> T.copy(context: Context): T? {
         }
     }
 }
+
+fun View?.isVisible(): Boolean {
+    if (this == null) {
+        return false
+    }
+    if (!this.isShown) {
+        return false
+    }
+    val actualPosition = Rect()
+    this.getGlobalVisibleRect(actualPosition)
+    val screen = Rect(0, 0, Resources.getSystem().displayMetrics.widthPixels, Resources.getSystem().displayMetrics.heightPixels)
+    return actualPosition.intersect(screen)
+}