vim-patch:9.1.0147: Cannot keep a buffer focused in a window

Problem:  Cannot keep a buffer focused in a window
          (Amit Levy)
Solution: Add the 'winfixbuf' window-local option
          (Colin Kennedy)

fixes:  vim/vim#6445
closes: vim/vim#13903

https://github.com/vim/vim/commit/215703563757a4464907ead6fb9edaeb7f430bea

N/A patch:
vim-patch:58f1e5c0893a

1 files changed, 54 insertions, 0 deletions

diff --git a/test/functional/options/winfixbuf_spec.lua b/test/functional/options/winfixbuf_spec.lua
new file mode 100644
index 0000000000..20407b9bb7
--- /dev/null
+++ b/test/functional/options/winfixbuf_spec.lua
@@ -0,0 +1,54 @@
+local helpers = require('test.functional.helpers')(after_each)
+local clear = helpers.clear
+local exec_lua = helpers.exec_lua
+
+describe("Nvim API calls with 'winfixbuf'", function()
+  before_each(function()
+    clear()
+  end)
+
+  it("Calling vim.api.nvim_win_set_buf with 'winfixbuf'", function()
+    local results = exec_lua([[
+      local function _setup_two_buffers()
+        local buffer = vim.api.nvim_create_buf(true, true)
+
+        vim.api.nvim_create_buf(true, true)  -- Make another buffer
+
+        local current_window = 0
+        vim.api.nvim_set_option_value("winfixbuf", true, {win=current_window})
+
+        return buffer
+      end
+
+      local other_buffer = _setup_two_buffers()
+      local current_window = 0
+      local results, _ = pcall(vim.api.nvim_win_set_buf, current_window, other_buffer)
+
+      return results
+    ]])
+
+    assert(results == false)
+  end)
+
+  it("Calling vim.api.nvim_set_current_buf with 'winfixbuf'", function()
+    local results = exec_lua([[
+      local function _setup_two_buffers()
+        local buffer = vim.api.nvim_create_buf(true, true)
+
+        vim.api.nvim_create_buf(true, true)  -- Make another buffer
+
+        local current_window = 0
+        vim.api.nvim_set_option_value("winfixbuf", true, {win=current_window})
+
+        return buffer
+      end
+
+      local other_buffer = _setup_two_buffers()
+      local results, _ = pcall(vim.api.nvim_set_current_buf, other_buffer)
+
+      return results
+    ]])
+
+    assert(results == false)
+  end)
+end)