Paint: Fix Image Editor Cursor Disappearing (T90120)

This patch fixes T90120.  The fundamental problem is that 2d and the old 3d paint modes share a single Paint struct, ToolSettings->imapaint.  This patch is a temporary fix until the new 3d paint mode (which has its own Paint struct) is released.

The patch works by listening for `NC_SCENE|ND_MODE` inside `image_listener` in `space_image.c`.   It does not use `ED_space_image_paint_update` since that requires a `bMain.`  Instead it calls `paint_cursor_start` (which is promoted to `ED_paint_cursor_start`).  `image_paint_poll` is also promoted to an `ED_` function.

Reviewed By: Campbell Barton
Differential Revision: https://developer.blender.org/D14946
Ref D14946

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/editors/include/ED_image.h b/source/blender/editors/include/ED_image.h
index 774115fa188..89e396c8035 100644
--- a/source/blender/editors/include/ED_image.h
+++ b/source/blender/editors/include/ED_image.h
@@ -24,6 +24,7 @@ struct Scene;
 struct SpaceImage;
 struct View2D;
 struct bContext;
+struct Paint;
 struct wmOperator;
 struct wmWindowManager;
 
@@ -187,6 +188,9 @@ ListBase ED_image_filesel_detect_sequences(struct Main *bmain,
                                            struct wmOperator *op,
                                            bool detect_udim);
 
+bool ED_image_tools_paint_poll(struct bContext *C);
+void ED_paint_cursor_start(struct Paint *p, bool (*poll)(struct bContext *C));
+
 #ifdef __cplusplus
 }
 #endif