Revert "* etc/TODO: Rearrange to start with "Simple tasks"."

This reverts commit 879ef5b19a.

Some of these items are a priority for the project and should be
before other, less prioritized items, according to a private
discussion with project co-maintainer Eli Zaretskii <eliz@gnu.org>.

etc/TODO

@@ -29,6 +29,81 @@ are the ones we consider more important, but these also may be
 difficult to fix.  Bugs with severity "minor" may be simpler, but this
 is not always true.
 
+* Speed up Elisp execution
+
+** Speed up function calls
+Change src/bytecode.c so that calls from byte-code functions to byte-code
+functions don't go through Ffuncall/funcall_lambda/exec_byte_code but instead
+stay within exec_byte_code.
+
+** Improve the byte-compiler to recognize immutable bindings
+Recognize immutable (lexical) bindings and get rid of them if they're
+used only once and/or they're bound to a constant expression.
+
+Such things aren't present in hand-written code, but macro expansion and
+defsubst can often end up generating things like
+(funcall (lambda (arg) (body)) actual) which then get optimized to
+(let ((arg actual)) (body)) but should additionally get optimized further
+when 'actual' is a constant/copyable expression.
+
+** Add an "indirect goto" byte-code
+Such a byte-code can be used for local lambda expressions.
+E.g. when you have code like
+
+   (let ((foo (lambda (x) bar)))
+     (dosomething
+      (funcall foo toto)
+      (blabla (funcall foo titi))))
+
+turn those 'funcalls' into jumps and their return into indirect jumps back.
+
+** Compile efficiently local recursive functions
+Similar to the previous point, we should be able to handle something like
+
+   (letrec ((loop () (blabla) (if (toto) (loop))))
+     (loop))
+
+which ideally should generate the same byte-code as
+
+   (while (progn (blabla) (toto)))
+
+* Things that were planned for Emacs-24
+
+** Concurrency
+Including it as an "experimental" compile-time option sounds good.  Of
+course there might still be big questions around "which form of
+concurrency" we'll want.
+
+** Better support for dynamic embedded graphics
+I like this idea (my mpc.el code could use it for the volume widget),
+though I wonder if the resulting efficiency will be sufficient.
+
+** Spread Semantic
+
+** Improve the "code snippets" support
+Consolidate skeleton.el, tempo.el, and expand.el (any other?) and then
+advertise/use/improve it.
+
+** Improve VC
+Yes, there's a lot of work to be done there :-(
+
+** Random things that cross my mind right now that I'd like to see
+Some of them from my local hacks, but it's not obvious at all whether
+they'll make it.
+
+*** Prog-mode could/should provide a better fill-paragraph default
+That default should use syntax-tables to recognize string/comment
+boundaries.
+
+*** Provide more completion-at-point-functions
+Make existing in-buffer completion use completion-at-point.
+
+*** "Functional" function-key-map
+It would make it easy to add (and remove) mappings like
+"FOO-mouse-4 -> FOO-scroll-down",   "FOO-tab -> ?\FOO-\t",
+"uppercase -> lowercase", "[fringe KEY...] -> [KEY]",
+"H-FOO -> M-FOO", "C-x C-y FOO -> H-FOO", ...
+
 * Simple tasks
 These don't require much Emacs knowledge and are suitable for anyone
 from beginners to experts.
@@ -151,44 +226,6 @@ https://lists.gnu.org/r/emacs-devel/2008-08/msg00456.html
 
 * Important features
 
-** Speed up Elisp execution
-
-*** Speed up function calls
-Change src/bytecode.c so that calls from byte-code functions to byte-code
-functions don't go through Ffuncall/funcall_lambda/exec_byte_code but instead
-stay within exec_byte_code.
-
-*** Improve the byte-compiler to recognize immutable bindings
-Recognize immutable (lexical) bindings and get rid of them if they're
-used only once and/or they're bound to a constant expression.
-
-Such things aren't present in hand-written code, but macro expansion and
-defsubst can often end up generating things like
-(funcall (lambda (arg) (body)) actual) which then get optimized to
-(let ((arg actual)) (body)) but should additionally get optimized further
-when 'actual' is a constant/copyable expression.
-
-*** Add an "indirect goto" byte-code
-Such a byte-code can be used for local lambda expressions.
-E.g. when you have code like
-
-   (let ((foo (lambda (x) bar)))
-     (dosomething
-      (funcall foo toto)
-      (blabla (funcall foo titi))))
-
-turn those 'funcalls' into jumps and their return into indirect jumps back.
-
-*** Compile efficiently local recursive functions
-Similar to the previous point, we should be able to handle something like
-
-   (letrec ((loop () (blabla) (if (toto) (loop))))
-     (loop))
-
-which ideally should generate the same byte-code as
-
-   (while (progn (blabla) (toto)))
-
 ** "Emacs as word processor"
 https://lists.gnu.org/r/emacs-devel/2013-11/msg00515.html
  rms writes:
@@ -446,15 +483,6 @@ consistency checks that make sure the new code computes the same results
 as the old code.  And once that works well, we can remove the old code
 and old fields.
 
-** Better support for dynamic embedded graphics
-I like this idea (my mpc.el code could use it for the volume widget),
-though I wonder if the resulting efficiency will be sufficient.
-
-** Concurrency
-Including it as an "experimental" compile-time option sounds good.  Of
-course there might still be big questions around "which form of
-concurrency" we'll want.
-
 ** FFI (foreign function interface)
 See eg https://lists.gnu.org/r/emacs-devel/2013-10/msg00246.html
 
@@ -862,32 +890,6 @@ The idea is to add an "X" of some kind, that when clicked deletes the
 window associated with that modeline.
 https://lists.gnu.org/r/emacs-devel/2007-09/msg02416.html
 
-** Improve the "code snippets" support
-Consolidate skeleton.el, tempo.el, and expand.el (any other?) and then
-advertise/use/improve it.
-
-** Improve VC
-Yes, there's a lot of work to be done there :-(
-
-** Spread Semantic
-
-** Random things that crossed Stefan Monnier's mind for Emacs 24
-Stefan Monnier writes: "Some of them from my local hacks, but it's not
-obvious at all whether they'll make it."
-
-*** Prog-mode could/should provide a better fill-paragraph default
-That default should use syntax-tables to recognize string/comment
-boundaries.
-
-*** Provide more completion-at-point-functions
-Make existing in-buffer completion use completion-at-point.
-
-*** "Functional" function-key-map
-It would make it easy to add (and remove) mappings like
-"FOO-mouse-4 -> FOO-scroll-down",   "FOO-tab -> ?\FOO-\t",
-"uppercase -> lowercase", "[fringe KEY...] -> [KEY]",
-"H-FOO -> M-FOO", "C-x C-y FOO -> H-FOO", ...
-
 * Things to be done for specific packages or features
 
 ** NeXTstep port