fix(statusline): don't leak memory with truncated click labels

2 files changed, 13 insertions, 0 deletions

diff --git a/src/nvim/statusline.c b/src/nvim/statusline.c
index 772b302023..29ce8dab71 100644
--- a/src/nvim/statusline.c
+++ b/src/nvim/statusline.c
@@ -1987,6 +1987,11 @@ int build_stl_str_hl(win_T *wp, char *out, size_t outlen, char *fmt, char *opt_n
       // the truncation point
       for (int i = 0; i < itemcnt; i++) {
         if (stl_items[i].start > trunc_p) {
+          for (int j = i; j < itemcnt; j++) {
+            if (stl_items[j].type == ClickFunc) {
+              XFREE_CLEAR(stl_items[j].cmd);
+            }
+          }
           itemcnt = i;
           break;
         }
diff --git a/test/functional/ui/statusline_spec.lua b/test/functional/ui/statusline_spec.lua
index 26a34f6d14..1c184ff27d 100644
--- a/test/functional/ui/statusline_spec.lua
+++ b/test/functional/ui/statusline_spec.lua
@@ -174,6 +174,14 @@ describe('statusline clicks', function()
     meths.input_mouse('right', 'press', '', 0, 6, 39)
     eq('0 1 r', eval("g:testvar"))
   end)
+
+  it('no memory leak with truncated click labels', function()
+    command([[
+      let &stl = '%@MyClickFunc@foo%X' .. repeat('a', 40) .. '%<t%@Test@bar%X%@Test@baz'
+    ]])
+    meths.input_mouse('left', 'press', '', 0, 6, 2)
+    eq('0 1 l', eval("g:testvar"))
+  end)
 end)
 
 describe('global statusline', function()