File Browser: Refactor access to the selection parameters struct

* Avoid direct access to `SpaceFile.params`, use a getter instead. This matters
  because once the asset-browser changes are in, there will be an alternative
  selection parameter object. The getter can return the correct one.
* Rename the function to ensure the parameters. The old name
  `ED_fileselect_get_params()` wasn't a mere getter, it would create the
  parameters if necessary. Now we have an actual getter, so better be clear.
* In some instances, I replaced the old "get" function with the new mere
  getter. So the ensure logic is called less often. However, in these cases we
  should be able to assume the selection parameters were created already as
  part of the editor creation routine.

The term "active" in the new function names may seem a bit odd in the current
context, but that is a preparation for the Asset Browser merge as well. Like
said, there will be two file selection parameter objects in the space.

1 files changed, 14 insertions, 1 deletions

diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index ff77819aae1..65ea155ffba 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -2467,6 +2467,18 @@ static PointerRNA rna_FileSelectParams_filter_id_get(PointerRNA *ptr)
   return rna_pointer_inherit_refine(ptr, &RNA_FileSelectIDFilter, ptr->data);
 }
 
+static PointerRNA rna_FileBrowser_params_get(PointerRNA *ptr)
+{
+  SpaceFile *sfile = ptr->data;
+  FileSelectParams *params = ED_fileselect_get_active_params(sfile);
+
+  if (params) {
+    return rna_pointer_inherit_refine(ptr, &RNA_FileSelectParams, params);
+  }
+
+  return rna_pointer_inherit_refine(ptr, NULL, NULL);
+}
+
 static void rna_FileBrowser_FSMenuEntry_path_get(PointerRNA *ptr, char *value)
 {
   char *path = ED_fsmenu_entry_get_path(ptr->data);
@@ -6043,7 +6055,8 @@ static void rna_def_space_filebrowser(BlenderRNA *brna)
   rna_def_space_generic_show_region_toggles(srna, (1 << RGN_TYPE_TOOLS) | (1 << RGN_TYPE_UI));
 
   prop = RNA_def_property(srna, "params", PROP_POINTER, PROP_NONE);
-  RNA_def_property_pointer_sdna(prop, NULL, "params");
+  RNA_def_property_struct_type(prop, "FileSelectParams");
+  RNA_def_property_pointer_funcs(prop, "rna_FileBrowser_params_get", NULL, NULL, NULL);
   RNA_def_property_ui_text(
       prop, "Filebrowser Parameter", "Parameters and Settings for the Filebrowser");