UV: minor adjustments to opacity adjustment

- Allow 0.0..1.0 range, as even at 0.0 the selection is still visible.
- Correct versioning code, not to overwrite the value for new files.

2 files changed, 10 insertions, 7 deletions

diff --git a/source/blender/blenloader/intern/versioning_290.c b/source/blender/blenloader/intern/versioning_290.c
index c6adbb5c7d2..0ce3cf405cd 100644
--- a/source/blender/blenloader/intern/versioning_290.c
+++ b/source/blender/blenloader/intern/versioning_290.c
@@ -23,6 +23,7 @@
 #include "BLI_listbase.h"
 #include "BLI_utildefines.h"
 
+#include "DNA_genfile.h"
 #include "DNA_screen_types.h"
 
 #include "BKE_collection.h"
@@ -49,12 +50,14 @@ void blo_do_versions_290(FileData *fd, Library *UNUSED(lib), Main *bmain)
   {
     /* Keep this block, even when empty. */
 
-    for (bScreen *screen = bmain->screens.first; screen; screen = screen->id.next) {
-      LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
-        LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
-          if (sl->spacetype == SPACE_IMAGE) {
-            SpaceImage *sima = (SpaceImage *)sl;
-            sima->uv_opacity = 1.0f;
+    if (!DNA_struct_elem_find(fd->filesdna, "SpaceImage", "float", "uv_opacity")) {
+      for (bScreen *screen = bmain->screens.first; screen; screen = screen->id.next) {
+        LISTBASE_FOREACH (ScrArea *, area, &screen->areabase) {
+          LISTBASE_FOREACH (SpaceLink *, sl, &area->spacedata) {
+            if (sl->spacetype == SPACE_IMAGE) {
+              SpaceImage *sima = (SpaceImage *)sl;
+              sima->uv_opacity = 1.0f;
+            }
           }
         }
       }
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index f6a7c74484a..c6a94aae450 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -2937,7 +2937,7 @@ static void rna_def_space_image_uv(BlenderRNA *brna)
 
   prop = RNA_def_property(srna, "uv_opacity", PROP_FLOAT, PROP_FACTOR);
   RNA_def_property_float_sdna(prop, NULL, "uv_opacity");
-  RNA_def_property_range(prop, 0.2f, 1.0f);
+  RNA_def_property_range(prop, 0.0f, 1.0f);
   RNA_def_property_ui_text(prop, "UV Opacity", "Opacity of UV overlays");
   RNA_def_property_update(prop, NC_SPACE | ND_SPACE_IMAGE, NULL);