Fix T75750 Image Editor: Rendered result is much brighter than in viewport

Referenced by commit 3ea4d3dc07, Fix (unreported) Image Editor UI drawing too dark
Referenced by issue #75856, Backface culling viewport setting doesn't update right away
Referenced by issue #75767, Cycles renders image too bright compare to old builds
Referenced by issue #75750, Rendered result is much brighter than in viewport

source/blender/editors/space_image/space_image.c

@@ -669,9 +669,14 @@ static void image_main_region_draw(const bContext *C, ARegion *region)
   /* we set view2d from own zoom and offset each time */
   image_main_region_set_view2d(sima, region);
 
+  /* Image are still drawn in display space. */
+  glDisable(GL_FRAMEBUFFER_SRGB);
+
   /* we draw image in pixelspace */
   draw_image_main(C, region);
 
+  glEnable(GL_FRAMEBUFFER_SRGB);
+
   /* and uvs in 0.0-1.0 space */
   UI_view2d_view_ortho(v2d);