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bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs).
From: |
Keith David Bershatsky |
Subject: |
bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs). |
Date: |
Thu, 02 May 2019 17:48:18 -0700 |
VERSION: 019.002 [05/02/2019]
CHANGELOG:
- Eliminated the usage of a Lisp_Object within `mc_update_text_area' in favor of
an array of structs. [Every Lisp_Object that is eliminated will reduce the
need for garbage collection.]
- Eliminated `mc/save-window-scroll' when using the multiple-crosshairs library
written by Magnar Sveen. [Said function caused non-selected windows to be
updated during redisplay, resulting in undue slowdown.]
- Miscellaneous changes regarding when/what stderr messages are to appear when
running M-x trace-redisplay; and, changed the name of the function responsible
for erasing fake cursors and resetting the cache: `mc_pre_scroll_clean'.
Eliminated the message to run "M-x mc-install" when `crosshairs.el` loads.
SETUP:
Step 1: git clone -b master git://git.sv.gnu.org/emacs.git
Step 2: In the new emacs folder, go back to an Emacs version from 04/08/2019:
git reset --hard a038df77de7b1aa2d73a6478493b8838b59e4982
Step 3: From within the new emacs folder created in Step 1, apply the patch:
git apply /path/to/the/patch.diff
Step 4: ./autogen.sh
Step 5: ./configure ... [your custom options]
Step 6: make
Step 7: make install
USAGE:
- For a minimal working example of built-in fake cursors, type: M-x mc-test
;;; TURN ON FAKE CURSORS (buffer position, cursor-type, cursor color):
(setq mc-conf '((1 "hbar" "magenta")
(2 "bar" "purple")
(3 "box" "#00FF00")
(4 "hollow" "#0000FF")
(5 ("hbar" 3) [1.0 0.0 1.0])
(6 ("bar" 3) [0.0 1.0 1.0])
(7 "framed" "OrangeRed"))))
;;; TURN OFF FAKE CURSORS:
(setq mc-conf nil)
- To try out the crosshairs feature, type: M-x +-mode
- To try out built-in fake cursors with Magnar Sveen's multiple-cursors package,
install that package first. [If the multiple-cursors package is installed, an
eval-after-load "multiple-cursors-core" statement within `crosshairs.el` will
redefine a couple of functions and set up a few keyboard shortcuts.] If the
multiple-cursors package by Magnar Sveen is not already installed, then here
are two easy ways to install that package:
Type: M-x mc-install
OR, evaluate the following snippet:
(progn
(require 'package)
(add-to-list 'package-archives '("melpa" .
"http://melpa.milkbox.net/packages/") t)
(package-initialize)
(package-refresh-contents)
(package-install 'multiple-cursors))
TODO:
- Add support for `ch_inactive_windows' and `fc_inactive_windows'.
- When using the multiple fake cursors feature, a fake cursor does not show up
at
zv_p.
- Deal with left/right overwritten glyphs in the w32 and X ports of Emacs.
- Reduce the removal of fake cursors to the bare minimum when scrolling the text
on the glass directly, and whenever `update_window' is called.
- When an idle-timer fires and point is at the end of a horizontally scrolled
line in a narrow window, the temporary horizontal scroll is canceled. Create
an minimal working example and file a bug report.
- There is a bug affecting an older version of Emacs for the NS port that causes
partial line flickering when the same characters are grouped together (;;;;;;)
and MC_GLYPHLESS cursors are above or below -- having the same background
color
as the frame; e.g., black on black (used to erase a glyphless cursor). The
partial flickering is only noticeable with rapid fire; e.g., holding down the
right/left arrow key. When changing the color of the glyphless cursor, the
issue is not present. [@lawlist has verified that the X and HPOS coordinates
are accurate.]
- There is a bug affecting the recorded `w->mc.lnum_pixel_width` that is
observable when not running under gdb, but disappears when running under gdb.
While viewing a folded org-mode buffer, the non-gdb instance had a visible
line number pixel-width of 44, but Emacs treated it as fluctuating between
44 and 55 as the cursor was moved to the end of line. In the gdb instance,
the visible line number pixel width was 55 with no fluctuation under the same
conditions as the non-gdb instance. This appears to be a different bug than
bug#32177 (current line number shifts one column to the left) because the line
number of the current line does not shift left, and changing the bidi settings
did not correct the issue.
- The current test for `auto_hscroll_mode_p' only looks for `current_line` and
all five related tests are based upon that assumption, which may not be true.
- Multiple Cursors: If point is in the middle of a composite character, then
select a fully composed character so that the fake cursor is visible.
- Implement functionality similar to the Lisp multiple-cursors by Magnar Sveen.
- Follow up with the Emacs team re bug#32177; i.e., (Current line number shifts
one column to the left.)
- Follow up with the Emacs team re bug#32060; i.e., Horizontal Scrolling
(Current Line): Wrong line gets h-scrolled.
- Determine if bug #28936 needs to be fixed and help the Emacs team re same.
2019_05_02__17_44_54_096.diff
Description: application/diff
- bug#17684: #22873 (multiple fake cursors); and, #17684 (crosshairs).,
Keith David Bershatsky <=