commit 75a1a9415b9c207de5a29b25c0d1949c6c9c5c61
author Bram Moolenaar <Bram@vim.org> Thu Jun 20 03:45:36 2019 +0200
committer Bram Moolenaar <Bram@vim.org> Thu Jun 20 03:45:36 2019 +0200
tree 470a0887aed4e52e342edbca555e0bec1b85af99
parent a3fce62c911c204ae144b55018f6dc9295088850

patch 8.1.1575: callbacks may be garbage collected

Problem:    Callbacks may be garbage collected.
Solution:   Set reference in callbacks. (Ozaki Kiichi, closes #4564)

src/testdir/test_popupwin.vim

diff --git a/src/testdir/test_popupwin.vim b/src/testdir/test_popupwin.vim
index 451f0b6..c332dca 100644
--- a/src/testdir/test_popupwin.vim
+++ b/src/testdir/test_popupwin.vim
@@ -1467,3 +1467,19 @@
 
   call popup_close(winid)
 endfunc
+
+func Test_popupwin_garbage_collect()
+  func MyPopupFilter(x, winid, c)
+    " NOP
+  endfunc
+
+  let winid = popup_create('something', {'filter': function('MyPopupFilter', [{}])})
+  call test_garbagecollect_now()
+  redraw
+  " Must not crach caused by invalid memory access
+  call feedkeys('j', 'xt')
+  call assert_true(v:true)
+
+  call popup_close(winid)
+  delfunc MyPopupFilter
+endfunc