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bug#23774: 25.1.50; NS port cursor hides character beneath

From: Alan Third
Subject: bug#23774: 25.1.50; NS port cursor hides character beneath
Date: Wed, 15 Jun 2016 20:18:38 +0100

When switching between Mac OS "spaces", the character under the cursor
is not drawn.

emacs -Q
C-p C-p C-x 2

There should now be two windows with the cursor over a ';' character.

Switch to another space, and switch back.

The "active" cursor will momentarily show as black without ';' visible,
until it's redrawn. The inactive cursor will remain blank until
something else causes the screen to redraw.

This is appears to be limited to OS X, I don't see the same behaviour
under GNUStep.

Oddly, if the Emacs frame is NOT the active window when you switch back
to it's space, the cursor works as expected.

In GNU Emacs (x86_64-apple-darwin15.5.0, NS appkit-1404.47 Version 
10.11.5 (Build 15F34))
 of 2016-06-11 built on breton.holly.idiocy.org
Repository revision: eacdc9eb6c89346fb72535632a1c65f6483b639f
Windowing system distributor 'Apple', version 10.3.1404
Recent messages:
Mark set
Mark saved where search started
Mark set
Making completion list... [2 times]
Making completion list...
Making completion list...

Configured features:

Important settings:
  value of $LANG: en_GB.UTF-8
  locale-coding-system: utf-8

Major mode: ObjC/l

Minor modes in effect:
  diff-auto-refine-mode: t
  magit-auto-revert-mode: t
  auto-revert-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  global-flycheck-mode: t
  flycheck-mode: t
  show-paren-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Load-path shadows:
None found.

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nnoo parse-time gnus-spec gnus-int gnus-range gnus-win gnus nnheader
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Memory information:
((conses 16 812501 92754)
 (symbols 48 47956 87)
 (miscs 40 1240 1331)
 (strings 32 133425 18878)
 (string-bytes 1 4045032)
 (vectors 16 75041)
 (vector-slots 8 1527559 105286)
 (floats 8 3393 468)
 (intervals 56 42717 1001)
 (buffers 976 35))

Alan Third

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