Fix crash on forgetting a window on a stack #59
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Similarly to b2a72cf which was caused by `c->next` following `free(c)`, `s->next` is following `free(s)` causing a crash. A way to reproduce: 1. Start xterm 2. Run `gvim -f` 3. Put GVim's window on a stack 4. Press Ctrl-Z in xterm 5. Execute `exit` twice (first time just prints a warning about a stopped job) 6. euclid-wm should crash here on trying to forget a window that's currently hidden, specifically on dropping a corresponding `struct stack_item`
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Similarly to b2a72cf which was caused by
c->nextfollowingfree(c),s->nextis followingfree(s)causing a crash.A way to reproduce:
gvim -fexittwice (first time just prints a warning about a stopped job)struct stack_item