file: Deduplicate speed tradeoff code

The nautilus_file_should_show_thumbnail() method was first introduced
in commit 469047a2a58430026d68a3b99b223b922b18b8d1

It duplicated the tradeoff setting logic that was already present in
get_speed_tradeoff_preference_for_file(), a shared function for both
top left text preview and child directories item count.
(Top left text preview has since been phased out.)

The code duplication grew when support for the filesystem::use-preview
attribute was added in commit 00e59a6b3c10ec4c3915b61d09498b4110189917

Instead, let's make should_show_thumbnail() use the shared function.

1 files changed, 33 insertions, 69 deletions

diff --git a/src/nautilus-file.c b/src/nautilus-file.c
index a9047d3de..817241a21 100644
--- a/src/nautilus-file.c
+++ b/src/nautilus-file.c
@@ -4744,31 +4744,17 @@ nautilus_file_get_filesystem_remote (NautilusFile *file)
     return FALSE;
 }
 
-gboolean
-nautilus_file_should_show_thumbnail (NautilusFile *file)
+static gboolean
+get_speed_tradeoff_preference_for_file (NautilusFile               *file,
+                                        NautilusSpeedTradeoffValue  value)
 {
-    const char *mime_type;
     GFilesystemPreviewType use_preview;
 
-    use_preview = nautilus_file_get_filesystem_use_preview (file);
-
-    mime_type = file->details->mime_type;
-    if (mime_type == NULL)
-    {
-        mime_type = "application/octet-stream";
-    }
+    g_return_val_if_fail (NAUTILUS_IS_FILE (file), FALSE);
 
-    /* If the thumbnail has already been created, don't care about the size
-     * of the original file.
-     */
-    if (nautilus_thumbnail_is_mimetype_limited_by_size (mime_type) &&
-        file->details->thumbnail_path == NULL &&
-        nautilus_file_get_size (file) > cached_thumbnail_limit)
-    {
-        return FALSE;
-    }
+    use_preview = nautilus_file_get_filesystem_use_preview (file);
 
-    if (show_file_thumbs == NAUTILUS_SPEED_TRADEOFF_ALWAYS)
+    if (value == NAUTILUS_SPEED_TRADEOFF_ALWAYS)
     {
         if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
         {
@@ -4779,15 +4765,15 @@ nautilus_file_should_show_thumbnail (NautilusFile *file)
             return TRUE;
         }
     }
-    else if (show_file_thumbs == NAUTILUS_SPEED_TRADEOFF_NEVER)
+    else if (value == NAUTILUS_SPEED_TRADEOFF_NEVER)
     {
         return FALSE;
     }
-    else
+    else if (value == NAUTILUS_SPEED_TRADEOFF_LOCAL_ONLY)
     {
         if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
         {
-            /* file system says to never thumbnail anything */
+            /* file system says to never preview anything */
             return FALSE;
         }
         else if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_IF_LOCAL)
@@ -4805,6 +4791,30 @@ nautilus_file_should_show_thumbnail (NautilusFile *file)
     return FALSE;
 }
 
+gboolean
+nautilus_file_should_show_thumbnail (NautilusFile *file)
+{
+    const char *mime_type;
+
+    mime_type = file->details->mime_type;
+    if (mime_type == NULL)
+    {
+        mime_type = "application/octet-stream";
+    }
+
+    /* If the thumbnail has already been created, don't care about the size
+     * of the original file.
+     */
+    if (nautilus_thumbnail_is_mimetype_limited_by_size (mime_type) &&
+        file->details->thumbnail_path == NULL &&
+        nautilus_file_get_size (file) > cached_thumbnail_limit)
+    {
+        return FALSE;
+    }
+
+    return get_speed_tradeoff_preference_for_file (file, show_file_thumbs);
+}
+
 static gboolean
 nautilus_is_video_file (NautilusFile *file)
 {
@@ -5660,52 +5670,6 @@ show_directory_item_count_changed_callback (gpointer callback_data)
     show_directory_item_count = g_settings_get_enum (nautilus_preferences, NAUTILUS_PREFERENCES_SHOW_DIRECTORY_ITEM_COUNTS);
 }
 
-static gboolean
-get_speed_tradeoff_preference_for_file (NautilusFile               *file,
-                                        NautilusSpeedTradeoffValue  value)
-{
-    GFilesystemPreviewType use_preview;
-
-    g_return_val_if_fail (NAUTILUS_IS_FILE (file), FALSE);
-
-    use_preview = nautilus_file_get_filesystem_use_preview (file);
-
-    if (value == NAUTILUS_SPEED_TRADEOFF_ALWAYS)
-    {
-        if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
-        {
-            return FALSE;
-        }
-        else
-        {
-            return TRUE;
-        }
-    }
-
-    if (value == NAUTILUS_SPEED_TRADEOFF_NEVER)
-    {
-        return FALSE;
-    }
-
-    g_assert (value == NAUTILUS_SPEED_TRADEOFF_LOCAL_ONLY);
-
-    if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_NEVER)
-    {
-        /* file system says to never preview anything */
-        return FALSE;
-    }
-    else if (use_preview == G_FILESYSTEM_PREVIEW_TYPE_IF_LOCAL)
-    {
-        /* file system says we should treat file as if it's local */
-        return TRUE;
-    }
-    else
-    {
-        /* only local files */
-        return !nautilus_file_is_remote (file);
-    }
-}
-
 gboolean
 nautilus_file_should_show_directory_item_count (NautilusFile *file)
 {