[babl] babl: search depth of 2 and 4, instead of 2 and 5

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 9ebe30e43559d24865f6ba5c32c6b2d07a9ef3b1
Author: Øyvind Kolås <pippin gimp org>
Date:   Sat May 23 18:53:36 2020 +0200

    babl: search depth of 2 and 4, instead of 2 and 5
    
    Conversions needed for color management in GIMP are not feasible in 2
    steps, searching 5 deep for commonly used conversions causes severe UI
    stalls, lowering the max search depth to 4 avoids this regression
    introduced in 51437f216dbbef80f9bf661dd152452083119349, while keeping
    the speed-up for other cases.

 babl/babl-fish-path.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/babl/babl-fish-path.c b/babl/babl-fish-path.c
index 7a55d4449..ab4361683 100644
--- a/babl/babl-fish-path.c
+++ b/babl/babl-fish-path.c
@@ -603,10 +603,10 @@ babl_fish_path2 (const Babl *source,
 
     get_conversion_path (&pc, (Babl *) source, 0, max_path_length (), tolerance);
 
-    /* attempt with path length + 3 */
+    /* attempt with path length + 2 */
     if (babl->fish_path.conversion_list->count == 0)
     {
-      int max_length = max_path_length () + 3;
+      int max_length = max_path_length () + 2;
       if  (max_length > BABL_HARD_MAX_PATH_LENGTH)
         max_length = BABL_HARD_MAX_PATH_LENGTH;