Revert that SDImageCacheQueryMemoryOnly because it's misunderstanding…

…. Use `imageFromMemoryCacheForKey` instead

SDWebImage/SDImageCache.h

@@ -26,18 +26,14 @@ typedef NS_ENUM(NSInteger, SDImageCacheType) {
 };
 
 typedef NS_OPTIONS(NSUInteger, SDImageCacheOptions) {
-    /**
-     * By default, we will query disk cache if the memory cache missed. This mask can force to query memory cache only without disk data.
-     */
-    SDImageCacheQueryMemoryOnly = 1 << 0,
     /**
      * By default, we do not query disk data when the image is cached in memory. This mask can force to query disk data at the same time.
      */
-    SDImageCacheQueryDataWhenInMemory = 1 << 1,
+    SDImageCacheQueryDataWhenInMemory = 1 << 0,
     /**
      * By default, we query the memory cache synchronously, disk cache asynchronously. This mask can force to query disk cache synchronously.
      */
-    SDImageCacheQueryDiskSync = 1 << 2
+    SDImageCacheQueryDiskSync = 1 << 1
 };
 
 typedef void(^SDCacheQueryCompletedBlock)(UIImage * _Nullable image, NSData * _Nullable data, SDImageCacheType cacheType);

SDWebImage/SDImageCache.m

@@ -377,7 +377,7 @@ - (nullable NSOperation *)queryCacheOperationForKey:(nullable NSString *)key opt
 
     // First check the in-memory cache...
     UIImage *image = [self imageFromMemoryCacheForKey:key];
-    BOOL shouldQueryMemoryOnly = (options & SDImageCacheQueryMemoryOnly) || (image && !(options & SDImageCacheQueryDataWhenInMemory));
+    BOOL shouldQueryMemoryOnly = (image && !(options & SDImageCacheQueryDataWhenInMemory));
     if (shouldQueryMemoryOnly) {
         if (doneBlock) {
             doneBlock(image, nil, SDImageCacheTypeMemory);

SDWebImage/SDWebImageManager.h

@@ -25,7 +25,7 @@ typedef NS_OPTIONS(NSUInteger, SDWebImageOptions) {
     SDWebImageLowPriority = 1 << 1,
 
     /**
-     * This flag disables on-disk caching, including cache query and cache storing
+     * This flag disables on-disk caching after the download finished, only cache in memory
      */
     SDWebImageCacheMemoryOnly = 1 << 2,
 

SDWebImage/SDWebImageManager.m

@@ -146,7 +146,6 @@ - (void)diskImageExistsForURL:(nullable NSURL *)url
     NSString *key = [self cacheKeyForURL:url];
 
     SDImageCacheOptions cacheOptions = 0;
-    if (options & SDWebImageCacheMemoryOnly) cacheOptions |= SDImageCacheQueryMemoryOnly;
     if (options & SDWebImageQueryDataWhenInMemory) cacheOptions |= SDImageCacheQueryDataWhenInMemory;
     if (options & SDWebImageQueryDiskSync) cacheOptions |= SDImageCacheQueryDiskSync;