fix(column): redraw and update signcols for paired extmark

Problem:  Signcolumn width does not increase when ranged sign does not
          start at sentinel line.
Solution: Handle paired range of added sign when checking signcols.

1 files changed, 5 insertions, 4 deletions

diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index 86cf805345..2a3cebc0ae 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -4055,7 +4055,7 @@ void buf_signcols_del_check(buf_T *buf, linenr_T line1, linenr_T line2)
 ///
 /// @param buf   buffer to check
 /// @param added sign being added
-void buf_signcols_add_check(buf_T *buf, linenr_T lnum)
+void buf_signcols_add_check(buf_T *buf, linenr_T line1, linenr_T line2)
 {
   if (!buf->b_signcols.valid) {
     return;
@@ -4066,7 +4066,9 @@ void buf_signcols_add_check(buf_T *buf, linenr_T lnum)
     return;
   }
 
-  if (lnum == buf->b_signcols.sentinel) {
+  linenr_T sent = buf->b_signcols.sentinel;
+
+  if (sent >= line1 && sent <= line2) {
     if (buf->b_signcols.size == buf->b_signcols.max) {
       buf->b_signcols.max++;
     }
@@ -4075,12 +4077,11 @@ void buf_signcols_add_check(buf_T *buf, linenr_T lnum)
     return;
   }
 
-  int signcols = decor_signcols(buf, lnum - 1, lnum - 1, SIGN_SHOW_MAX);
+  int signcols = decor_signcols(buf, line1 - 1, line2 - 1, SIGN_SHOW_MAX);
 
   if (signcols > buf->b_signcols.size) {
     buf->b_signcols.size = signcols;
     buf->b_signcols.max = signcols;
-    buf->b_signcols.sentinel = lnum;
     redraw_buf_later(buf, UPD_NOT_VALID);
   }
 }