Fix [#30136] Adding Sequence Plugin fails.

Problem was in how file selector is called by the effect_strip_add operator invoke. WM_operator_filesel() is not suited, as it directly calls exec if filepath is already set, and sequencer_generic_invoke_xy__internal() will set that path unless otherwise told. So using rather the same way to do as the one used by the other "strip_add" operators...

1 files changed, 2 insertions, 1 deletions

diff --git a/source/blender/editors/space_sequencer/sequencer_add.c b/source/blender/editors/space_sequencer/sequencer_add.c
index 9aed4b3d78a..03fd22d1045 100644
--- a/source/blender/editors/space_sequencer/sequencer_add.c
+++ b/source/blender/editors/space_sequencer/sequencer_add.c
@@ -713,7 +713,8 @@ static int sequencer_add_effect_strip_invoke(bContext *C, wmOperator *op, wmEven
 
 	if (is_type_set && type==SEQ_PLUGIN) {
 		/* only plugins need the file selector */
-		return WM_operator_filesel(C, op, event);
+		WM_event_add_fileselect(C, op);
+		return OPERATOR_RUNNING_MODAL;
 	}
 	else {
 		return sequencer_add_effect_strip_exec(C, op);