fix(mark): mark without a view restores at topline #19224

For a local mark without a view, currently trying to restore its view
will put the cursor at topline, which is not the correct behavior.
Initialize `topline_offset` to `MAXLNUM` instead to fix this.

2 files changed, 4 insertions, 1 deletions

diff --git a/src/nvim/mark.c b/src/nvim/mark.c
index 2402ea3035..0bf5875269 100644
--- a/src/nvim/mark.c
+++ b/src/nvim/mark.c
@@ -607,6 +607,8 @@ void mark_view_restore(fmark_T *fm)
 {
   if (fm != NULL && fm->view.topline_offset >= 0) {
     linenr_T topline = fm->mark.lnum - fm->view.topline_offset;
+    // If the mark does not have a view, topline_offset is MAXLNUM,
+    // and this check can prevent restoring mark view in that case.
     if (topline >= 1) {
       set_topline(curwin, topline);
     }
diff --git a/src/nvim/mark_defs.h b/src/nvim/mark_defs.h
index 16d85a6e51..a78056c5f9 100644
--- a/src/nvim/mark_defs.h
+++ b/src/nvim/mark_defs.h
@@ -64,9 +64,10 @@ typedef enum {
 /// Represents view in which the mark was created
 typedef struct fmarkv {
   linenr_T topline_offset;  ///< Amount of lines from the mark lnum to the top of the window.
+                            ///< Use MAXLNUM to indicate that the mark does not have a view.
 } fmarkv_T;
 
-#define INIT_FMARKV { 0 }
+#define INIT_FMARKV { MAXLNUM }
 
 /// Structure defining single local mark
 typedef struct filemark {