Fix T84850: "Lock to Selection" causes unwanted jumps

Adding new tracks, mask points, mask primitives, changing selection was
causing an unwanted jumps in the view.

This change makes it so those operations are preserving view offset.

Differential Revision: https://developer.blender.org/D10146

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/editors/mask/mask_intern.h b/source/blender/editors/mask/mask_intern.h
index f6990583383..ee1784011ea 100644
--- a/source/blender/editors/mask/mask_intern.h
+++ b/source/blender/editors/mask/mask_intern.h
@@ -23,6 +23,8 @@
 
 #pragma once
 
+#include "ED_clip.h"
+
 struct Mask;
 struct bContext;
 struct wmOperatorType;
@@ -92,6 +94,19 @@ void ED_mask_select_flush_all(struct Mask *mask);
 bool ED_maskedit_poll(struct bContext *C);
 bool ED_maskedit_mask_poll(struct bContext *C);
 
+/* Generalized solution for preserving editor viewport when making changes while lock-to-selection
+ * is enabled.
+ * Any mask operator can use this API, without worrying that some editors do not have an idea of
+ * lock-to-selection. */
+
+typedef struct MaskViewLockState {
+  ClipViewLockState space_clip_state;
+} MaskViewLockState;
+
+void ED_mask_view_lock_state_store(const struct bContext *C, MaskViewLockState *state);
+void ED_mask_view_lock_state_restore_no_jump(const struct bContext *C,
+                                             const MaskViewLockState *state);
+
 /* mask_query.c */
 bool ED_mask_find_nearest_diff_point(const struct bContext *C,
                                      struct Mask *mask,