Created attachment 116338 [details] Demo video: note the drag'n'drop mouse cursor Left-clicking on the slide pane starts dragging very easily, which often causes unacceptable duplication of slides.
Well I clicked around furiously for a minute like in your video, but for me at least I really need to want to click AND drag to even trigger something like that (the "forbidden" cursor icon).. and I wasn't able to duplicate any slide. Win 7 Pro 64-bit Version: 5.1.0.0.alpha1+ Build ID: 698b344fdf42cc9738d5e91cd27876ce1ff39daf TinderBox: Win-x86@39, Branch:master, Time: 2015-06-10_02:24:19 Locale: fi-FI (fi_FI)
I know, it works fine on Windows. However it is an annoying issue on Linux. Feels like mouse coordinates delta threshold should be increased. I've figured out that version 4.0.0.3 is still ok, while 4.0.1.1 gives this behavior.
I tried now also on Linux with a similarly furious clicking excercise, but was unable to reproduce the problem. I want to point out that one person on Reddit seems to have this same issue: http://www.reddit.com/r/libreoffice/comments/39cnvt/accidentally_copying_slides_in_impress/ Ubuntu 15.04 64-bit Version: 5.1.0.0.alpha1+ Build ID: 0d754a386fb44f970f33a3e71b2f0f3cfb7c4598 TinderBox: Linux-rpm_deb-x86_64@46-TDF-dbg, Branch:master, Time: 2015-06-09_16:20:41 Locale: en-US (en_US.UTF-8)
Hmm, this seems distro specific, it works that way on Slackware (even when using unpacked debs from libreoffice.org). I wonder what system that person on Reddit has.
Got dets from the Reddit user: libreoffice 4.2.7.2, running ubuntu 14.04 w/ xfce via crouton on an ARM chromebook To the original reporter: could you try with the latest 4.4.x version? Set to NEEDINFO. Change back to UNCONFIRMED, if the problem persists with 4.4. Change to RESOLVED WORKSFORME, if the problem went away.
After some tests I have to conclude that this is due to input devices (touchpad and mouse with kind of contact bounce). It behaves the same way in 4.4 (however as I wrote before version 4.0.0.3 worked flawlessly in the same environment). I wonder if it is possible to rebuild LibreOffice with increased drag threshold. I could not find for example gtk_drag_check_threshold in the code.