https://bugs.documentfoundation.org/show_bug.cgi?id=166846
Bug ID: 166846
Summary: Cannot move slides in certain window manager/backend
combinations
Product: LibreOffice
Version: 25.2.3.2 release
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Impress
Assignee: [email protected]
Reporter: [email protected]
Description:
I cannot reorder slides in LibreOffice Impress.
Interestingly, I found that the environment variables QT_QPA_PLATFORM,
SAL_USE_VCLPLUGIN and GDK_BACKEND can influence the outcome. I am running KDE
Plasma with Wayland. I'll elaborate the results in each combination of the env
vars.
Steps to Reproduce:
1. Open libreoffice
2. Create three slides, with titles "aaa", "bbb" and "ccc" in that order. I
added the titles just for identifying those slides.
3. Save it as "reorder-example.odp" so that we can open the same file and try
different combinations.
4. Inside the "Slides" side bar on the left, move the mouse cursor onto the
slide "aaa", press and hold the left mouse button.
5. Start moving the mouse.
6. Move the mouse to the gap between the slides "bbb" and "ccc".
7. Release the left mouse button.
8. Close the Impress window. Do not save if asked.
Then restart Impress with the following commands, and repeat step 4 to step 8
- QT_QPA_PLATFORM=xcb libreoffice reorder-example.odp
- SAL_USE_VCLPLUGIN=gtk4 libreoffice reorder-example.odp
- GDK_BACKEND=x11 SAL_USE_VCLPLUGIN=gtk4 libreoffice reorder-example.odp
(Note: Since I am using KDE Plasma Wayland, Qt and GTK will use their Wayland
backends by default unless overridden by QT_QPA_PLATFORM and GTK_BACKEND).
Also try moving the slides in the "Slides Sorter" view in each combination.
Also try moving slides by right-clicking the slide -> "move" -> "slide down".
Actual Results:
With bare "libreoffice" command,
- After step 5, the mouse cursor becomes the prohibited sign (like the
Unicode character "🛇" (U+1F6C7)). This doesn't look right.
- After step 6, a rectangle with "1" in the middle appears between the slides
"bbb" and "ccc".
- After step 7, "aaa" is still the first slide. The order of the three
slides are not changed.
- Step 8 does not ask me to save the file.
With "QT_QPA_PLATFORM=xcb libreoffice reorder-example.odp"
- After step 5, same as above.
- After step 6, same as above.
- After step 7, "aaa" is successfully moved between "bbb" and "ccc".
- Step 8 asks me to save the file.
With "SAL_USE_VCLPLUGIN=gtk4 libreoffice reorder-example.odp"
- After step 5, it crashes immediately, with the log message in the terminal:
"Gdk-Message: 23:46:49.286: Error 32 (Broken pipe) dispatching to Wayland
display."
With "GDK_BACKEND=x11 SAL_USE_VCLPLUGIN=gtk4 libreoffice reorder-example.odp"
- After step 5, same as when using the bare "libreoffice" command.
- After step 6, same as when using the bare "libreoffice" command.
- After step 7, the slide "aaa" disappears. Only two slides, namely "bbb"
and "ccc", are left in the document. Pressing CTRL+Z will make "aaa" appear
again.
- Step 8 asks me to save the file.
Dragging slides with mouse in the "Slides Sorter" view behaves exactly the same
as in the "Slides" left side bar in all env var combinations.
The "context menu -> move -> slide down" approach works in all env var
combinations, even with "SAL_USE_VCLPLUGIN=gtk4 libreoffice
reorder-example.odp" which crashes if I drag the slides.
Expected Results:
Step 5: the mouse cursor should be a "hand" icon instead of a "prohibited
sign".
Step 7 should successfully move the slide to the right position.
It should behave the same in the "Slides Sorter" view.
Reproducible: Always
User Profile Reset: Yes
Additional Info:
Help - About LibreOffice: (Note that the "SAL_USE_VCLPLUGIN=gtk4" env var will
change "VCL" to "gtk4".)
Version: 25.2.3.2 (X86_64) / LibreOffice Community
Build ID: 520(Build:2)
CPU threads: 32; OS: Linux 6.14; UI render: default; VCL: kf6 (cairo+wayland)
Locale: en-US (en_US.UTF-8); UI: en-US
25.2.3-3
Calc: threaded
Some more information:
Linux distribution: ArchLinux
packages:
- libreoffice-fresh: 25.2.3-3
- qt-base: 6.9.0-2
- plasma-desktop: 6.3.5-1
- kwin: 6.3.5-1
- gtk4: 1:4.18.5-2
- wayland: 1.23.1-2
- xorg-xwayland: 24.1.6-1
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