fix to allow [#24009] to be fixed.

WM_operator_poll() could fail in cases WM_operator_name_call() would succeed because calling the operator would setup the context before calling poll.
this would result in python raising an invalid error or menu items being greyed out.

now python can also check with an operator context:
  bpy.ops.object.editmode_toggle.poll('INVOKE_SCREEN') 

2 files changed, 2 insertions, 2 deletions

diff --git a/source/blender/editors/interface/interface.c b/source/blender/editors/interface/interface.c
index eee4f133043..099629b0422 100644
--- a/source/blender/editors/interface/interface.c
+++ b/source/blender/editors/interface/interface.c
@@ -629,7 +629,7 @@ void uiEndBlock(const bContext *C, uiBlock *block)
 			if(but->context)
 				CTX_store_set((bContext*)C, but->context);
 
-			if(ot == NULL || WM_operator_poll((bContext*)C, ot)==0) {
+			if(ot == NULL || WM_operator_poll_context((bContext*)C, ot, but->opcontext)==0) {
 				but->flag |= UI_BUT_DISABLED;
 				but->lock = 1;
 			}
diff --git a/source/blender/editors/interface/interface_regions.c b/source/blender/editors/interface/interface_regions.c
index 5f8d604817a..e244565a6a6 100644
--- a/source/blender/editors/interface/interface_regions.c
+++ b/source/blender/editors/interface/interface_regions.c
@@ -434,7 +434,7 @@ ARegion *ui_tooltip_create(bContext *C, ARegion *butregion, uiBut *but)
 		if(but->flag & UI_BUT_DISABLED) {
 			const char *poll_msg;
 			CTX_wm_operator_poll_msg_set(C, NULL);
-			WM_operator_poll(C, but->optype);
+			WM_operator_poll_context(C, but->optype, but->opcontext);
 			poll_msg= CTX_wm_operator_poll_msg_get(C);
 			if(poll_msg) {
 				BLI_snprintf(data->lines[data->totline], sizeof(data->lines[0]), "Disabled: %s", poll_msg);