Public bug reported:
Under Kubuntu 18.04.2 LTS, the import tool leaves remnants of the
selection rectangle in the captured screenshot. Those are also visible
in real-time when moving the mouse to adjust the size of the selection
rectangle, as if the old-sized rectangle is not always erased before the
new-sized rectangle is drawn. There also seems to be some kind of
double buffering going on (in the KDE compositor?) so that the display
alternates between multiple sets of rectangle remnants. Speculating a
bit, perhaps the double buffering is also the root cause for the problem
- maybe the old-sized rectangle *is* erased but in the wrong buffer.
The standard screenshot tool in KDE (accessed using the PrtScr key) does
not exhibit the problem using its equivalent mode (rectangular
selection).
Output from lsb_release -rd:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Output from apt-cache policy imagemagick-6.q16:
imagemagick-6.q16:
Installed: 8:6.9.7.4+dfsg-16ubuntu6.7
Candidate: 8:6.9.7.4+dfsg-16ubuntu6.7
Version table:
*** 8:6.9.7.4+dfsg-16ubuntu6.7 500
500 http://se.archive.ubuntu.com/ubuntu bionic-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64
Packages
100 /var/lib/dpkg/status
8:6.9.7.4+dfsg-16ubuntu6 500
500 http://se.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
What I expected to happen:
Obtaining a clean screenshot of the region corresponding to the
selection rectangle (as in attachment "emacs_screenshot_kde.png").
What happened instead:
Obtained a screenshot including remnants from the selection rectangle
(see attachment "emacs_screenshot_imagemagick.png").
** Affects: imagemagick (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "emacs_screenshot_imagemagick.png"
https://bugs.launchpad.net/bugs/1834636/+attachment/5273985/+files/emacs_screenshot_imagemagick.png
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https://bugs.launchpad.net/bugs/1834636
Title:
Import selection rectangle leaves trails visible in screenshot
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