patch 9.0.0608: with spelling, deleting a full stop does not update next line
Problem: With spell checking, deleting a full stop at the end of a line
does not update SpellCap at the start of the next line.
Solution: Update the next line when characters have been deleted. Also when
using undo.
diff --git a/src/change.c b/src/change.c
index 038f3c1..67b7023 100644
--- a/src/change.c
+++ b/src/change.c
@@ -709,6 +709,13 @@
changedOneline(curbuf, lnum);
changed_common(lnum, col, lnum + 1, 0L);
+#ifdef FEAT_SPELL
+ // When text has been changed at the end of the line, possibly the start of
+ // the next line may have SpellCap that should be removed or it needs to be
+ // displayed. Schedule the next line for redrawing just in case.
+ if (spell_check_window(curwin) && lnum < curbuf->b_ml.ml_line_count)
+ redrawWinline(curwin, lnum + 1);
+#endif
#ifdef FEAT_DIFF
// Diff highlighting in other diff windows may need to be updated too.
if (curwin->w_p_diff)