Fix T58715: File Browser: Creating "New Folder" issues with too many existing folders in display.

Smotthscroll to edited entry was broken since filelisting was
rewritten to become async...

source/blender/editors/space_file/file_intern.h

@@ -28,6 +28,7 @@
 
 struct ARegion;
 struct ARegionType;
+struct FileSelectParams;
 struct SpaceFile;
 
 /* file_ops.c */
@@ -106,7 +107,6 @@ void file_sfile_to_operator_ex(bContext *C, struct wmOperator *op, struct SpaceF
 void file_sfile_to_operator(bContext *C, struct wmOperator *op, struct SpaceFile *sfile);
 void file_operator_to_sfile(bContext *C, struct SpaceFile *sfile, struct wmOperator *op);
 
-
 /* filesel.c */
 void fileselect_file_set(SpaceFile *sfile, const int index);
 float file_string_width(const char *str);
@@ -116,6 +116,8 @@ int file_select_match(struct SpaceFile *sfile, const char *pattern, char *matche
 int autocomplete_directory(struct bContext *C, char *str, void *arg_v);
 int autocomplete_file(struct bContext *C, char *str, void *arg_v);
 
+void file_params_renamefile_activate(struct SpaceFile *sfile, struct FileSelectParams *params);
+
 /* file_panels.c */
 void file_panels_register(struct ARegionType *art);
 

source/blender/editors/space_file/file_ops.c

@@ -1581,7 +1581,7 @@ static int file_smoothscroll_invoke(bContext *C, wmOperator *UNUSED(op), const w
 	ARegion *ar, *oldar = CTX_wm_region(C);
 	int offset;
 	int numfiles, numfiles_layout;
-	int edit_idx = 0;
+	int edit_idx = -1;
 	int i;
 
 	/* escape if not our timer */
@@ -1590,6 +1590,13 @@ static int file_smoothscroll_invoke(bContext *C, wmOperator *UNUSED(op), const w
 
 	numfiles = filelist_files_ensure(sfile->files);
 
+	/* Due to async nature of file listing, we may execute this code before `file_refresh()`
+	 * editing entry is available in our listing, so we also have to handle switching to rename mode here. */
+	FileSelectParams *params = ED_fileselect_get_params(sfile);
+	if (params->renamefile[0] != '\0') {
+		file_params_renamefile_activate(sfile, params);
+	}
+
 	/* check if we are editing a name */
 	for (i = 0; i < numfiles; ++i) {
 		if (filelist_entry_select_index_get(sfile->files, i, CHECK_ALL) ) {
@@ -1599,9 +1606,13 @@ static int file_smoothscroll_invoke(bContext *C, wmOperator *UNUSED(op), const w
 	}
 
 	/* if we are not editing, we are done */
-	if (0 == edit_idx) {
-		WM_event_remove_timer(CTX_wm_manager(C), CTX_wm_window(C), sfile->smoothscroll_timer);
-		sfile->smoothscroll_timer = NULL;
+	if (edit_idx == -1) {
+		/* Do not invalidate timer if filerename is still pending, we might still be building the filelist
+		 * and yet have to find edited entry... */
+		if (params->renamefile[0] == '\0') {
+			WM_event_remove_timer(CTX_wm_manager(C), CTX_wm_window(C), sfile->smoothscroll_timer);
+			sfile->smoothscroll_timer = NULL;
+		}
 		return OPERATOR_PASS_THROUGH;
 	}
 
@@ -1671,7 +1682,6 @@ static int file_smoothscroll_invoke(bContext *C, wmOperator *UNUSED(op), const w
 
 void FILE_OT_smoothscroll(wmOperatorType *ot)
 {
-
 	/* identifiers */
 	ot->name = "Smooth Scroll";
 	ot->idname = "FILE_OT_smoothscroll";

source/blender/editors/space_file/filesel.c

@@ -732,5 +732,25 @@ void ED_fileselect_exit(wmWindowManager *wm, ScrArea *sa, SpaceFile *sfile)
 		MEM_freeN(sfile->files);
 		sfile->files = NULL;
 	}
-
+}
+
+/** Helper used by both main update code, and smoothscroll timer, to try to enable rename editing from
+ * params->renamefile name. */
+void file_params_renamefile_activate(SpaceFile *sfile, FileSelectParams *params)
+{
+	BLI_assert(params->renamefile[0] != '\0');
+
+	const int idx = filelist_file_findpath(sfile->files, params->renamefile);
+	if (idx >= 0) {
+		FileDirEntry *file = filelist_file(sfile->files, idx);
+		if (file) {
+			filelist_entry_select_set(sfile->files, file, FILE_SEL_ADD, FILE_SEL_EDITING, CHECK_ALL);
+		}
+	}
+	BLI_strncpy(sfile->params->renameedit, sfile->params->renamefile, sizeof(sfile->params->renameedit));
+	/* File listing is now async, do not clear renamefile if matching entry not found
+	 * and dirlist is not finished! */
+	if (idx >= 0 || filelist_is_ready(sfile->files)) {
+		params->renamefile[0] = '\0';
+	}
 }

source/blender/editors/space_file/space_file.c

@@ -260,19 +260,7 @@ static void file_refresh(const bContext *C, ScrArea *sa)
 	}
 
 	if (params->renamefile[0] != '\0') {
-		int idx = filelist_file_findpath(sfile->files, params->renamefile);
-		if (idx >= 0) {
-			FileDirEntry *file = filelist_file(sfile->files, idx);
-			if (file) {
-				filelist_entry_select_set(sfile->files, file, FILE_SEL_ADD, FILE_SEL_EDITING, CHECK_ALL);
-			}
-		}
-		BLI_strncpy(sfile->params->renameedit, sfile->params->renamefile, sizeof(sfile->params->renameedit));
-		/* File listing is now async, do not clear renamefile if matching entry not found
-		 * and dirlist is not finished! */
-		if (idx >= 0 || filelist_is_ready(sfile->files)) {
-			params->renamefile[0] = '\0';
-		}
+		file_params_renamefile_activate(sfile, params);
 	}
 
 	if (sfile->layout) {