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fix(float): crash from nasty :fclose autocmds (#36137)

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Problem: :fclose may crash Nvim if autocommands close floats prematurely.
Alternatively, :fclose may call win_close for windows not in curtab if
autocommands change curtab or move windows between tab pages via
nvim_win_set_config (may not crash, but is wrong).

Solution: check win_valid before calling win_close.

(cherry picked from commit 3ccba4cdff)

Backports #36134.
This commit is contained in:
Sean Dewar
2025-10-11 18:37:03 +01:00
committed by GitHub
parent 5c583a8616
commit 86b2c0f201
2 changed files with 51 additions and 1 deletions
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49
test/functional/ui/float_spec.lua
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@@ -1122,6 +1122,55 @@ describe('float window', function()
]])
end)
it(':fclose does not crash from nasty autocommands', function()
local w1 = api.nvim_open_win(0, false, { relative = 'editor', row = 0, col = 0, width = 5, height = 5, zindex = 6 })
local w2 = api.nvim_open_win(0, false, { relative = 'editor', row = 0, col = 0, width = 5, height = 5, zindex = 5 })
local w3 = api.nvim_open_win(0, false, { relative = 'editor', row = 0, col = 0, width = 5, height = 5, zindex = 4 })
local w4 = api.nvim_open_win(0, true, { relative = 'editor', row = 0, col = 0, width = 5, height = 5, zindex = 3 })
exec_lua(function()
vim.api.nvim_create_autocmd('WinClosed', {
once = true,
callback = function()
vim.api.nvim_win_close(w2, true)
end,
})
end)
-- We close just the first three floats with highest zindex, so w4 remains open.
-- (despite w2 being closed early by the autocommand rather than directly by :fclose)
command('3fclose')
eq(false, api.nvim_win_is_valid(w1))
eq(false, api.nvim_win_is_valid(w2))
eq(false, api.nvim_win_is_valid(w3))
eq(true, api.nvim_win_is_valid(w4))
-- Try switching tab pages and moving windows between tab pages via nvim_win_set_config.
-- Simplest if :fclose skips windows in non-current tabpages.
local w5 = api.nvim_open_win(0, false, { relative = 'editor', row = 0, col = 0, width = 5, height = 5, zindex = 2 })
command('autocmd WinEnter * ++once tabnew')
eq(w4, api.nvim_get_current_win())
local tp1 = api.nvim_get_current_tabpage()
command('fclose!')
eq(false, api.nvim_win_is_valid(w4))
eq(true, api.nvim_win_is_valid(w5))
neq(tp1, api.nvim_get_current_tabpage())
local w_tp2 = api.nvim_get_current_win()
api.nvim_set_current_tabpage(tp1)
local w6 = api.nvim_open_win(0, false, { relative = 'editor', row = 0, col = 0, width = 5, height = 5, zindex = 1 })
exec_lua(function()
vim.api.nvim_create_autocmd('WinClosed', {
once = true,
callback = function()
vim.api.nvim_win_set_config(w6, { win = w_tp2, split = 'below' })
end,
})
end)
command('fclose!')
eq(false, api.nvim_win_is_valid(w5))
eq(true, api.nvim_win_is_valid(w6))
neq(tp1, api.nvim_win_get_tabpage(w6))
end)
local function with_ext_multigrid(multigrid)
local screen, attrs
before_each(function()