vim-patch:8.2.1874: can't do something just before leaving Insert mode

Problem:    Can't do something just before leaving Insert mode.
Solution:   Add the InsertLeavePre autocommand event. (closes vim/vim#7177)
b53e13a91a

N/A patches for version.c:

vim-patch:8.1.1877: graduated features scattered

Problem:    Graduated features scattered.
Solution:   Put graduated and obsolete features together.
ffc0716af8

vim-patch:8.2.1875: warning when building GTK gui

Problem:    Warning when building GTK gui.
Solution:   Add missing function parameter.
3da855c8e2

vim-patch:8.2.1877: test for function list fails

Problem:    Test for function list fails.
Solution:   Move "obsolete" comments one line up.
b8f519e538

vim-patch:8.2.1878: GTK: error for redefining function

Problem:    GTK: error for redefining function. (Tony Mechelynck)
Solution:   Remove "gtk_" prefix from local functions and prepend "gui_" to
            global functions.
8a99e66b4f

vim-patch:8.2.1881: cannot build with GTK3

Problem:    Cannot build with GTK3.
Solution:   Adjust form functions.
692d1a51e7

vim-patch:8.2.1883: compiler warnings when using Python

Problem:    Compiler warnings when using Python.
Solution:   Adjust PyCFunction to also have the second argument.  Use "int"
            return type for some functions.  Insert "(void *)" to get rid of
            the remaining warnings.
4ce5fe4c87

src/nvim/auevents.lua

@@ -65,7 +65,8 @@ return {
     'InsertChange',           -- when changing Insert/Replace mode
     'InsertCharPre',          -- before inserting a char
     'InsertEnter',            -- when entering Insert mode
-    'InsertLeave',            -- when leaving Insert mode
+    'InsertLeave',            -- just after leaving Insert mode
+    'InsertLeavePre',         -- just before leaving Insert mode
     'MenuPopup',              -- just before popup menu is displayed
     'OptionSet',              -- after setting any option
     'QuickFixCmdPost',        -- after :make, :grep etc.