improving rotation handling

app/build.gradle

@@ -75,7 +75,7 @@ dependencies {
     implementation 'com.squareup.picasso:picasso:2.71828'
     implementation 'com.caverock:androidsvg-aar:1.3'
     implementation 'com.github.tibbi:gestureviews:985ba285fb'
-    implementation 'com.github.tibbi:subsampling-scale-image-view:40dc6ee2b1'
+    implementation 'com.github.tibbi:subsampling-scale-image-view:51cb8f922c'
     kapt 'com.github.bumptech.glide:compiler:4.8.0' // keep it here too, not just in Commons, else loading SVGs wont work
 
     kapt 'androidx.room:room-compiler:2.0.0'

app/src/main/kotlin/com/simplemobiletools/gallery/pro/fragments/PhotoFragment.kt

@@ -444,6 +444,11 @@ class PhotoFragment : ViewPagerFragment() {
             override fun make() = PicassoRegionDecoder()
         }
 
+        var newOrientation = (rotation + mCurrentRotationDegrees) % 360
+        if (newOrientation < 0) {
+            newOrientation += 360
+        }
+
         val config = context!!.config
         mView.subsampling_view.apply {
             setMaxTileSize(if (config.showHighestQuality) Integer.MAX_VALUE else 4096)
@@ -454,7 +459,7 @@ class PhotoFragment : ViewPagerFragment() {
             maxScale = 10f
             beVisible()
             isOneToOneZoomEnabled = config.allowOneToOneZoom
-            orientation = (rotation + mCurrentRotationDegrees) % 360
+            orientation = newOrientation
             setImage(path)
             onImageEventListener = object : SubsamplingScaleImageView.OnImageEventListener {
                 override fun onReady() {
@@ -472,16 +477,14 @@ class PhotoFragment : ViewPagerFragment() {
                 }
 
                 override fun onImageRotation(degrees: Int) {
-                    if (mCurrentRotationDegrees != degrees) {
                     val fullRotation = (rotation + degrees) % 360
                     val useWidth = if (fullRotation == 90 || fullRotation == 270) sHeight else sWidth
                     val useHeight = if (fullRotation == 90 || fullRotation == 270) sWidth else sHeight
                     doubleTapZoomScale = getDoubleTapZoomScale(useWidth, useHeight)
-                        loadBitmap(degrees, false)
+                    mCurrentRotationDegrees = (mCurrentRotationDegrees + degrees) % 360
+                    loadBitmap(mCurrentRotationDegrees, false)
                     activity?.invalidateOptionsMenu()
                 }
-                    mCurrentRotationDegrees = degrees
-                }
             }
         }
     }