File Browser: Manual auto-increase name support for output filepaths

This functionality was present until Blender 2.80.  Basically it adds back the
"+" and "-" buttons in the file browser when it stores an output filepath.

This is useful for someone rendering multiple versions of an animation (or a
composition) to compare.

At the moment this is used for the render output, and the File Output node in
the compositor.

Differential Revision: https://developer.blender.org/D15968

1 files changed, 8 insertions, 10 deletions

diff --git a/source/blender/windowmanager/intern/wm_operator_props.c b/source/blender/windowmanager/intern/wm_operator_props.c
index 71c948dfbb9..bd3322a8023 100644
--- a/source/blender/windowmanager/intern/wm_operator_props.c
+++ b/source/blender/windowmanager/intern/wm_operator_props.c
@@ -120,16 +120,14 @@ void WM_operator_properties_filesel(wmOperatorType *ot,
     RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
   }
 
-  if (action == FILE_SAVE) {
-    /* NOTE: this is only used to check if we should highlight the filename area red when the
-     * filepath is an existing file. */
-    prop = RNA_def_boolean(ot->srna,
-                           "check_existing",
-                           true,
-                           "Check Existing",
-                           "Check and warn on overwriting existing files");
-    RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
-  }
+  /* NOTE: this is only used to check if we should highlight the filename area red when the
+   * filepath is an existing file. */
+  prop = RNA_def_boolean(ot->srna,
+                         "check_existing",
+                         action == FILE_SAVE,
+                         "Check Existing",
+                         "Check and warn on overwriting existing files");
+  RNA_def_property_flag(prop, PROP_HIDDEN | PROP_SKIP_SAVE);
 
   prop = RNA_def_boolean(
       ot->srna, "filter_blender", (filter & FILE_TYPE_BLENDER) != 0, "Filter .blend files", "");