Log Message:
Update to version 8.1.1778.

While there, enable vimdiff and vimtutor.

Changes:
8.1.1567  localtime_r() does not respond to $TZ changes
8.1.1568  strftime() test fails on MS-Windows
8.1.1569  cannot build with signs but without diff feature
8.1.1570  icon signs not displayed properly in the number column
8.1.1571  textprop highlight starts too early if just after a tab
8.1.1572  compiler warnings with tiny build
8.1.1573  textprop test fails if screenhots do not work
8.1.1574  tabpage option not yet implemented for popup window
8.1.1575  callbacks may be garbage collected
8.1.1576  compiler warning for unused argument
8.1.1577  command line redrawn for +arabic without Arabic characters
8.1.1578  MS-Windows: pathdef.c should depend on build options
8.1.1579  dict and list could be GC'ed while displaying error
8.1.1580  cannot make part of a popup transparent
8.1.1581  shared functions for testing are disorganised
8.1.1582  cannot build with +textprop but without +timers
8.1.1583  set_ref_in_list() only sets ref in items
8.1.1584  the evalfunc.c file is getting too big
8.1.1585  :let-heredoc does not trim enough
8.1.1586  error number used in two places
8.1.1587  redraw problem when sign icons in the number column
8.1.1588  in :let-heredoc line continuation is recognized
8.1.1589  popup window does not indicate scroll position
8.1.1590  popup window test fails
8.1.1591  on error garbage collection may free memory in use
8.1.1592  may start file dialog while exiting
8.1.1593  filetype not detected for C++ header files without extension
8.1.1594  may still start file dialog while exiting
8.1.1595  MS-Windows with VIMDLL: colors wrong in GUI
8.1.1596  when resizing the screen may draw popup in wrong position
8.1.1597  cannot scroll a popup window with the mouse
8.1.1598  update to test file missing
8.1.1599  compiler warning for uninitialized variable
8.1.1600  cannot specify highlighting for popup window scrollbar
8.1.1601  missing changes to popup window test file
8.1.1602  popup window cannot overflow on the left or right
8.1.1603  crash when using unknown highlighting in text property
8.1.1604  popup window scroll test is flaky
8.1.1605  Vim may delay processing messages on a json channel
8.1.1606  on a narrow screen ":hi" output is confusing
8.1.1607  popup window scrollbar does not respond to click
8.1.1608  the evalfunc.c file is too big
8.1.1609  the user cannot easily close a popup window
8.1.1610  there is no way to add or load a buffer without side effects
8.1.1611  bufadd() reuses existing buffer without a name
8.1.1612  cannot show an existing buffer in a popup window
8.1.1613  popup window test fails with Athena and Motif
8.1.1614  'numberwidth' can only go up to 10
8.1.1615  crash when passing buffer number to popup_create()
8.1.1616  build failure with gcc on Amiga
8.1.1617  no test for popup window with mask and position fixed
8.1.1618  Amiga-like systems quickly run out of stack
8.1.1619  tests are not run with GUI on Travis
8.1.1620  no test for popup window with border and mask
8.1.1621  Amiga: time.h included twice
8.1.1622  wrong width if displaying a lot of lines in a popup window
8.1.1623  display wrong with signs in narrow number column
8.1.1624  when testing in the GUI may try to run gvim in a terminal
8.1.1625  script line numbers are not exactly right
8.1.1626  no test for closing a popup window with a modified buffer
8.1.1627  header file contains mixed comment style
8.1.1628  popup window functions not in list of functions
8.1.1629  terminal function help is in the wrong file
8.1.1630  various small problems
8.1.1631  displaying signs is inefficient
8.1.1632  build with EXITFREE but without +arabic fails
8.1.1633  cannot generate prototypes with X11 but without GUI
8.1.1634  terminal test fails when term_getansicolors() is missing
8.1.1635  warnings for unused variables in small version
8.1.1636  crash when popup has fitting scrollbar
8.1.1637  after running tests and clean the XfakeHOME directory remains
8.1.1638  running tests leaves some files behind
8.1.1639  changing an autoload name into a file name is inefficient
8.1.1640  the CursorHold autocommand takes down a balloon
8.1.1641  garbage collection may run at a wrong moment
8.1.1642  may use uninitialized variable
8.1.1643  sign placement is wrong when 'foldcolumn' is set
8.1.1644  sound test does not work on Travis
8.1.1645  cannot use a popup window for a balloon
8.1.1646  build failure
8.1.1647  build error with GTK and hangulinput feature
8.1.1648  MS-Windows: build error with normal feaures
8.1.1649  Illegal memory access when closing popup window
8.1.1650  warning for using uninitialized variable
8.1.1651  suspend test is flaky on some systems
8.1.1652  GUI: popup window doesn't close on mouse movement
8.1.1653  ubsan warns for possibly passing NULL pointer
8.1.1654  GUI: screen updates from 'balloonexpr' are not displayed
8.1.1655  popup window border drawn wrong with multi-byte char
8.1.1656  popup window width is wrong when using Tabs
8.1.1657  Terminal: screen updates from 'balloonexpr' are not displayed
8.1.1658  debug statements included in patch
8.1.1659  popup window "mousemoved" values not correct
8.1.1660  assert_fails() does not fail inside try/catch
8.1.1661  cannot build with +textprop but without +balloon_eval
8.1.1662  cannot build uninstal.exe with some version of MinGW
8.1.1663  compiler warning for using size_t
8.1.1664  GUI resize may cause changing Rows at a bad time
8.1.1665  crash when popup window with mask is below the screen
8.1.1666  click in popup window scrollbar with border doesn't scroll
8.1.1667  flags for Ex commands may clash with other symbols
8.1.1668  popup window test is a bit flaky on some systems
8.1.1669  Travis: test results section is closed even when failed
8.1.1670  sign column not always properly aligned
8.1.1671  copying a blob may result in it being locked
8.1.1672  "make cmdidxs" doesn't work
8.1.1673  cannot easily find the popup window at a certain position
8.1.1674  script to check a colorscheme can be improved
8.1.1675  listener list not correctly updated on listener_remove()
8.1.1676  "maxwidth" of popup window does not always work properly
8.1.1677  tests get stuck when running into an existing swapfile
8.1.1678  using popup_menu() does not scroll to show the selected line
8.1.1679  test using SwapExists autocommand file may fail
8.1.1680  the command table is not well aligned
8.1.1681  insert stray "{" when listener gets buffer line
8.1.1682  placing a larger number of signs is slow
8.1.1683  dictionary with string keys is longer than needed
8.1.1684  profiling functionality is spread out
8.1.1685  missing file in distributed file list
8.1.1686  "*" of "*{" is recognized as multipy operator
8.1.1687  the evalfunc.c file is too big
8.1.1688  old makefiles are no longer useful
8.1.1689  profiling code is spread out
8.1.1690  default padding for popup window menu is too much
8.1.1691  diff test fails on some systems
8.1.1692  using *{} for literal dict is not backwards compatible
8.1.1693  syntax coloring and highlighting is in one big file
8.1.1694  the RUN_VIM variable is longer than needed
8.1.1695  Windows 10: crash when cursor is at bottom of terminal
8.1.1696  MSVC: link command line is too long
8.1.1697  cannot build with MSVC
8.1.1698  Appveyor build with MSVC fails
8.1.1699  highlight_ga can be local instead of global
8.1.1700  listener callback called for the wrong buffer
8.1.1701  Appveyor build with MSVC fails puts progress bar in log
8.1.1702  compiler warning for uninitialized variable
8.1.1703  breaking out of loop by checking window pointer insufficient
8.1.1704  C-R C-W does not work after C-G when using 'incsearch'
8.1.1705  using ~{} for a literal dict is not nice
8.1.1706  typo in #ifdef
8.1.1707  Coverity warns for possibly using a NULL pointer
8.1.1708  Coverity warns for using uninitialized variable
8.1.1709  Coverity warns for possibly using a NULL pointer
8.1.1710  Coverity found dead code
8.1.1711  listener callback called at the wrong moment
8.1.1712  signs in number column cause text to be misaligned
8.1.1713  highlighting cursor line only works with popup_menu()
8.1.1714  cannot preview a file in a popup window
8.1.1715  emoji characters are seen as word characters for spelling
8.1.1716  old style comments are wasting space
8.1.1717  last char in menu popup window highlighted
8.1.1718  popup menu highlighting does not look good
8.1.1719  popup too wide when 'showbreak' is set
8.1.1720  crash with very long %[] pattern
8.1.1721  build failure with normal features without netbeans interface
8.1.1722  error when scriptversion is 2 a making a dictionary access
8.1.1723  heredoc assignment has no room for new features
8.1.1724  too much overhead checking for CTRL-C while processing text
8.1.1725  MS-Windows: E325 message may use incorrect date format
8.1.1726  the eval.txt help file is too big
8.1.1727  code for viminfo support is spread out
8.1.1728  wrong place for command line history viminfo support
8.1.1729  heredoc with trim not properly handled in function
8.1.1730  wrong place for mark viminfo support
8.1.1731  command line history not read from viminfo on startup
8.1.1732  completion in cmdwin does not work for buffer-local commands
8.1.1733  the man ftplugin leaves an empty buffer behind
8.1.1734  the evalfunc.c file is too big
8.1.1735  can't build with tiny features
8.1.1736  viminfo support is spread out
8.1.1737  :args command that outputs one line gives more prompt
8.1.1738  testing lambda with timer is slow
8.1.1739  deleted match highlighting not updated in other window
8.1.1740  exepath() doesn't work for "bin/cat"
8.1.1741  cleared/added match highlighting not updated in other window
8.1.1742  still some match functions in evalfunc.c
8.1.1743  'hlsearch' and match highlighting in the wrong place
8.1.1744  build error without the conceal feature
8.1.1745  compiler warning for unused argument
8.1.1746  ":dl" is seen as ":dlist" instead of \ 
":delete"
8.1.1747  compiler warning for unused variables
8.1.1748  :args output is not aligned
8.1.1749  Coverity warns for using negative index
8.1.1750  depending on the terminal width :version may miss a line break
8.1.1751  when redrawing popups plines_win() may be called often
8.1.1752  resizing hashtable is inefficient
8.1.1753  use of popup window mask is inefficient
8.1.1754  build failure
8.1.1755  leaking memory when using a popup window mask
8.1.1756  autocommand that splits window messes up window layout
8.1.1757  text added with appendbufline() isn't displayed
8.1.1758  count of g$ not used correctly when text is not wrapped
8.1.1759  no mode char for terminal mapping from maparg()
8.1.1760  extra line break for wrapping output of :args
8.1.1761  filetype "vuejs" causes problems for some users
8.1.1762  some filetype rules are in the wrong place
8.1.1763  evalfunc.c is still too big
8.1.1764  ":browse oldfiles" is not tested
8.1.1765  get(func, dict, def) does not work properly
8.1.1766  code for writing session file is spread out
8.1.1767  FEAT_SESSION defined separately
8.1.1768  man plugin changes setting in current window
8.1.1769  'shellslash' is also used for completion
8.1.1770  cannot get the window ID of the popup preview window
8.1.1771  options test fails on MS-Windows
8.1.1772  options test still fails on MS-Windows
8.1.1773  the preview popup window may be too far to the right
8.1.1774  test is silently skipped
8.1.1775  error message may be empty in filetype test
8.1.1776  text added with a job isn't displayed
8.1.1777  useless checks for job feature in channel test
8.1.1778  not showing the popup window right border is confusing