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bug#4892: compute_motion, mouse_position

From: David Reitter
Subject: bug#4892: compute_motion, mouse_position
Date: Mon, 9 Nov 2009 12:10:17 -0500

I've run into problems with mouse-position and compute-motion while debugging the broken drag&drop mechanism for faces in the NS port.
These problems are probably not specific to NS.

1. (mouse-position) does not return the selected frame when several frames overlap (partially). To reproduce, I arrange the frames on the screen, then select the lower one by clicking with the mouse, then the one that's supposed to go on top. With the mouse cursor still over the intersecting section (on top of the upper frame), I do M-: (mouse- position). This will then return the wrong frame. Reproducible with Emacs -Q (NS port with NS frames)

2. (compute-motion) does not correspond to what's shown on the screen when word-wrap is turned on.

3. (mouse-position) is incorrect when face-remapping-alist is used, enlarging the default face, for example.

I hope these are sufficiently specific to understand and identify the code, if not reproduce. Let me know if not, and I can elaborate.

In GNU Emacs (i386-apple-darwin10.0.0, NS apple- appkit-1038.11)
 of 2009-10-08 on scarlett.local
Windowing system distributor `Apple', version 10.3.1038
configured using `configure '--with-ns' '--without-x' 'CC=gcc -arch i386''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  which-function-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> C-x 5 2 <help-echo> <switch-frame> <help-echo>
<help-echo> <escape> : ( m o u s e - p o s i t i o
n ) <return> <help-echo> <down-mouse-1> <help-echo>
<mouse-1> <help-echo> <down-mouse-1> <mouse-1> <help-echo>
<down-mouse-1> <mouse-1> <help-echo> <escape> : <up>
<return> <help-echo> <help-echo> <switch-frame> <help-echo>
<help-echo> <help-echo> <escape> : <up> <return> <help-echo>
<down-mouse-1> <help-echo> <mouse-1> <help-echo> <down-mouse-1>
<mouse-1> <help-echo> <down-mouse-1> <mouse-1> <escape>
: <up> <return> <help-echo> <down-mouse-1> <mouse-1>
s-n C-x k <return> s-v C-x C-e <switch-frame> C-x C-f
<backspace> <backspace> t e s t <return> <help-echo>
C-y <down-mouse-1> <mouse-1> <escape> x n s - s h o
w - c o l o <tab> <return> <backspace> <backspace>
<backspace> <backspace> <backspace> <backspace> <backspace>
<backspace> <backspace> c o l o <tab> <return> <ns-drag-color>
<ns-drag-color> <down-mouse-1> <mouse-1> <down-mouse-1>
<mouse-1> <down-mouse-1> <mouse-1> <escape> x e n l
a r <tab> <tab> C-g <escape> x z o o m <tab> <tab>
C-g <escape> x g r o w <tab> <tab> C-g <menu-bar> <help-menu>

Recent messages:
Mark set

#<frame /Users/dr/test 0x7d5900>


#<frame /Users/dr/test 0x7d5900>

Making completion list...
Quit [2 times]

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