[Bf-blender-cvs] [cd2bf1fc91d] master: Fix T61191: First undo step missing in text editor

[Campbell Barton]

Commit: cd2bf1fc91d7d940ebd32be0ef60d04d0f2a8af1
Author: Campbell Barton
Date:   Wed Feb 6 12:55:26 2019 +1100
Branches: master
https://developer.blender.org/rBcd2bf1fc91d7d940ebd32be0ef60d04d0f2a8af1

Fix T61191: First undo step missing in text editor

===================================================================

M	source/blender/editors/space_text/text_undo.c

===================================================================

diff --git a/source/blender/editors/space_text/text_undo.c b/source/blender/editors/space_text/text_undo.c
index 869c7d03af9..88a37e8e51d 100644
--- a/source/blender/editors/space_text/text_undo.c
+++ b/source/blender/editors/space_text/text_undo.c
@@ -65,16 +65,11 @@ typedef struct TextUndoStep {
 	TextUndoBuf data;
 } TextUndoStep;
 
-static bool text_undosys_poll(bContext *C)
+static bool text_undosys_poll(bContext *UNUSED(C))
 {
-	Text *text = CTX_data_edit_text(C);
-	if (text == NULL) {
-		return false;
-	}
-	if (ID_IS_LINKED(text)) {
-		return false;
-	}
-	return true;
+	/* Only use when operators initialized. */
+	UndoStack *ustack = ED_undo_stack_get();
+	return (ustack->step_init && (ustack->step_init->type == BKE_UNDOSYS_TYPE_TEXT));
 }
 
 static void text_undosys_step_encode_init(struct bContext *C, UndoStep *us_p)