Update runtime files.

runtime/doc/todo.txt

@@ -1,4 +1,4 @@
-*todo.txt*      For Vim version 8.2.  Last change: 2020 Aug 29
+*todo.txt*      For Vim version 8.2.  Last change: 2020 Sep 07
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -41,15 +41,45 @@ browser use: https://github.com/vim/vim/issues/1234
 Why does Test_invalid_sid() not work in the GUI?
 
 Making everything work:
-- Check :const works the same as in legacy script.
+- Should :const work the same as in legacy script?
+  Or should it work like in Typescript: only the variable is fixed, not the
+  value itself.
+  Then use ":const!" to also fix/lock the value?
+  Typescript uses "as const", which is weird.
+  Alternative:  const var = <const>value
+      looks quite strange quite verbose
+      But can be used in several places:
+	    SomeFunc(<const>[1, 2, 3])
+      In Vim this basically means "lock this value".
+      How about:
+	    SomeFunc(<const>[[1], [2], [3]])  # are sub-lists immutable?
+	    SomeFunc(<const>myList)  # is myList mutable afterwards?
+
 - Run the same tests in :def and Vim9 script, like in Test_expr7_not()
 - :put with a "=" register argument doesn't work, need to find the expression
   and compile it. (#6397)
 - At the Vim9 script level, keep script variables local to the block they are
-  declared in?  Need to remember what variables were declared and delete them
-  when leaving the block.
-- Implement { } block at the script level.
-- Use the line number argument with assert_fails() in many more tests.
+  declared in, like in Javascript (using :let).
+  -> Need to remember what variables were declared and delete them when
+     leaving the block.
+  -> if a function is defined it may need to keep the block-locals
+  Then Implement { } block at the script level.
+- Recognize call to assert_fails() and execute it in the function context?
+  Won't work if the command itself fails, not an expression failure:
+	assert_fails("unknown", "E99:")
+  Use try/catch is complicated:
+    let did_catch = false
+    try
+	unknown
+    catch
+	assert_caught('E99:')
+	did_catch = true
+    endtry
+    assert_true('did_catch')
+  Add a new command, 
+    assertfail
+       unknown
+    endassertfail E99:.*unknown
 - In autocmd: use legacy syntax, not whatever the current script uses?
 - need to check type when a declaration specifies a type: #6507
 	let nr: number = 'asdf'
@@ -181,10 +211,8 @@ Text properties:
 - :goto does not go to the right place when text properties are present.
   (#5930)
 - "cc" does not call inserted_bytes(). (Axel Forsman, #5763)
-- Get E685 with a sequence of commands. (#5674)
 - Combining text property with 'cursorline' does not always work (Billie
   Cleek, #5533)
-- Text properties spanning more than one line.  #5683
 - See remarks at top of src/textprop.c
 
 'incsearch' with :s:
@@ -263,7 +291,8 @@ Terminal emulator window:
 
 Error numbers available: E653
 
-Remove "MacOS X installation"?  $APPDIR is no longer set.
+Patch to implement the vimtutor with a plugin: #6414
+Was originally writtten by Felipe Morales.
 
 Remove SPACE_IN_FILENAME ? It is only used for completion.
 
@@ -372,9 +401,6 @@ When changing the crypt key the buffer should be considered modified.
 Like when changing 'fileformat'.  Save the old key in save_file_ff().
 (Ninu-Ciprian Marginean)
 
-Patch to implement the vimtutor with a plugin: #6414
-Was originally writtten by Felipe Morales.
-
 Strange sequence of BufWipeout and BufNew events while doing omni-complete.
 (Paul Jolly, #5656)
 Get BufDelete without preceding BufNew. (Paul Jolly, #5694)
@@ -397,6 +423,7 @@ Undo puts cursor in wrong line after "cG<Esc>" undo.
 Implement completion for "breakadd".  Should expand the second argument, e.g.
 "func", and then function names after ":breakadd func".  Including
 script-local functions.
+Also for ":profile".
 
 :unmap <c-n> gives error but does remove the mapping. (Antony Scriven, 2019
 Dec 19)
@@ -1222,8 +1249,6 @@ Suggestion to improve pt-br spell checking. (Marcelo D Montu, 2016 Dec 15,
 
 Error in test_startup_utf8 on Solaris. (Danek Duvall, 2016 Aug 17)
 
-Completion for :!cmd shows each match twice. #1435
-
 GTK: When adding a timer from 'balloonexpr' it won't fire, because
 g_main_context_iteration() doesn't return.  Need to trigger an event when the
 timer expires.
@@ -1422,9 +1447,6 @@ Undo message is not always properly displayed.  Patch by Ken Takata, 2013 oct
 3.  Doesn't work properly according to Yukihiro Nakadaira.
 Also see #1635.
 
-When 'keywordprg' starts with ":" the argument is still escaped as a shell
-command argument. (Romain Lafourcade, 2016 Oct 16, #1175)
-
 Idea from Sven: record sequence of keys.  Useful to show others what they are
 doing (look over the shoulder), and also to see what happened.
 Probably list of keystrokes, with some annotations for mode changes.