Commit: 85e455b2458f68c1d2c75fed7b5963fce4a70027
Author: Julian Eisel
Date:   Thu Apr 23 13:21:36 2015 +0200
Branches: master
https://developer.blender.org/rB85e455b2458f68c1d2c75fed7b5963fce4a70027

Fix slot menu not displayed if render result slot is empty

Caused by own mistake in 31f984bc3ffcc83834, reported by @sebastian_k in
IRC

===================================================================

M       source/blender/editors/space_image/image_buttons.c

===================================================================

diff --git a/source/blender/editors/space_image/image_buttons.c 
b/source/blender/editors/space_image/image_buttons.c
index 2fb0a7e..09ee5a2 100644
--- a/source/blender/editors/space_image/image_buttons.c
+++ b/source/blender/editors/space_image/image_buttons.c
@@ -1216,14 +1216,16 @@ void uiTemplateImageLayers(uiLayout *layout, bContext 
*C, Image *ima, ImageUser
                RenderResult *rr;
                const float dpi_fac = UI_DPI_FAC;
                const int menus_width = 160 * dpi_fac;
+               const bool is_render_result = (ima->type == IMA_TYPE_R_RESULT);
 
                /* use BKE_image_acquire_renderresult  so we get the correct 
slot in the menu */
                rr = BKE_image_acquire_renderresult(scene, ima);
-               if (ima->type == IMA_TYPE_R_RESULT) {
+               if (rr && is_render_result) {
                        uiblock_layer_pass_arrow_buttons(layout, ima, rr, 
iuser, menus_width, &ima->render_slot);
                }
                else {
-                       uiblock_layer_pass_buttons(layout, ima, rr, iuser, 
menus_width, NULL);
+                       uiblock_layer_pass_buttons(layout, ima, rr, iuser, 
menus_width,
+                                                  is_render_result ? 
&ima->render_slot : NULL);
                }
                BKE_image_release_renderresult(scene, ima);
        }

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