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, 3 insertions, 0 deletions

diff --git a/source/blender/editors/space_image/space_image.c b/source/blender/editors/space_image/space_image.c
index 9832fcfdb70..fa0b7d75a30 100644
--- a/source/blender/editors/space_image/space_image.c
+++ b/source/blender/editors/space_image/space_image.c
@@ -316,6 +316,9 @@ static void image_listener(const wmSpaceTypeListenerParams *params)
           ED_area_tag_redraw(area);
           break;
         case ND_MODE:
+          ED_paint_cursor_start(&params->scene->toolsettings->imapaint.paint,
+                             ED_image_tools_paint_poll);
+
           if (wmn->subtype == NS_EDITMODE_MESH) {
             ED_area_tag_refresh(area);
           }