[PATCH v3 0/2] MR2941: riched20: Set empty text by default in CreateTextServices.

[Santino Mazza (＠tati1454)]

This is to prevent NULL pointers when creating a standalone text service
that doesn't have any text set and then using functions like EM_SETSEL.
This NULL pointers doesn't happen when creating a richedit windows, because
it sets an empty text when the richedit window procedure handles the WM_CREATE event.

--
  v3: riched20: Check if row is null in editor_ensure_visible.
      riched20: Return NULL if no row is found in row_from_cursor.

https://gitlab.winehq.org/wine/wine/-/merge_requests/2941

[PATCH v3 1/2] riched20: Return NULL if no row is found in row_from_cursor.

[Santino Mazza]

From: Santino Mazza

---
 dlls/riched20/row.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/dlls/riched20/row.c b/dlls/riched20/row.c
index 715d2adbf62..922e92f5836 100644
--- a/dlls/riched20/row.c
+++ b/dlls/riched20/row.c
@@ -76,6 +76,7 @@ ME_Row *row_from_cursor( ME_Cursor *cursor )
     ME_DisplayItem *item;

item = ME_FindItemBack( run_get_di( cursor->run ), diStartRow );
+    if (!item) return NULL;
     return &item->member.row;
 }

[PATCH v3 2/2] riched20: Check if row is null in editor_ensure_visible.

[Santino Mazza]

From: Santino Mazza

---
 dlls/riched20/paint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/riched20/paint.c b/dlls/riched20/paint.c
index 8bc1b8bcd2f..8a4a16a8c2b 100644
--- a/dlls/riched20/paint.c
+++ b/dlls/riched20/paint.c
@@ -1212,7 +1212,7 @@ void editor_ensure_visible( ME_TextEditor *editor, ME_Cursor *cursor )
   ME_Paragraph *para = cursor->para;
   int x, y, yheight;

-
+  if (!row) return;
   if (editor->scrollbars & ES_AUTOHSCROLL)
   {
     x = run->pt.x + ME_PointFromChar( editor, run, cursor->nOffset, TRUE );

[PATCH v3 0/2] MR2941: Prevent NULL pointer in editor_ensure_visible when retrieving row from cursor.

[Huw Davies (＠huw)]

This looks like it's hiding the problem.  I think what you want to do is to call `ME_WrapMarkedParagraphs()` at the start of `set_selection()`.

[PATCH v3 0/2] MR2941: Prevent NULL pointer in editor_ensure_visible when retrieving row from cursor.

[Santino Mazza (＠tati1454)]

Apparently by just calling `ME_WrapMarkedParagraphs()` I get other crashes when running a program that makes use of Microsoft Forms. I solved this by calling `ME_UpdateRepaint()`, so basically the fix would be to call `ME_UpdateRepaint()` instead of `editor_ensure_visible`.