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====== KDE 5 / Kubuntu Tipps & Tricks ======

===== File Associations / Default Applications =====

Note: this research was done on Kubuntu 15.10 using KDE 5

Nowadays MIME types and .desktop files are involved in deciding which programs are used to open a certain file. See these wiki entries for [[https://wiki.archlinux.org/index.php/Default_applications|Arch Linux (recommended in-depth explanation)]] and [[https://wiki.debian.org/MIME|Debian]].

KDE uses ''ktraderclient5'' to determine the default program. Also ''xdg-open'' uses this program (see the function defapp_kde() in xdg-mime or the output of ''xdg-mime query default application/pdf''). It returns useful defaults such as using Okular to open pdfs even if Gimp is installed (''ktraderclient5 --mimetype application/pdf''). However, programs not relying on ''ktraderclient5'' (such as Firefox) won't get these defaults as they are not stated in any ''mimeapps.list'' file. (FIXME: where do the defaults actually come from? [[http://api.kde.org/frameworks-api/frameworks5-apidocs/kservice/html/kmimetypetrader_8cpp_source.html|Maybe dig into the code...]])

As soon as you explicitly configure program preferences with Dolphin the defined program order is written to ''~/.local/share/applications/mimeapps.list''. The order of entries displayed in Dolphin is reflected in the section [Added Associations]. The section [Default Applications] is filled in as well, but it seems that KDE ignores the default set there and sticks to the first program in [Added Associations].

The most useful way I identified to get consistent for all applications (KDE and non-KDE) is to explicitly set defaults in ''~/.local/share/applications/mimeapps.list'', which will be updated for all programs when using the GUI method in Dolphin.

<code>
[Default Applications]
application/pdf=kde4-okularApplication_pdf.desktop;
application/postscript=kde4-okularApplication_ghostview.desktop;
image/bmp=org.kde.gwenview.desktop;
image/gif=org.kde.gwenview.desktop;
image/jp2=kde4-okularApplication_kimgio.desktop;
image/jpeg=org.kde.gwenview.desktop;
image/png=org.kde.gwenview.desktop;
image/svg+xml=inkscape.desktop;
image/tiff=org.kde.gwenview.desktop;
</code>

===== Missing Ark Context Menus =====

<code>
sudo ln -s /usr/share/kde4/servicetypes/konqpopupmenuplugin.desktop /usr/share/kservicetypes5/
</code>
http://www.linuxgnut.com/dolphin-extract-menus-missing-in-kubuntu-1510



===== KDE 4 & Eclipse problems =====

==== Freezes when Debugging GUIs ====

Using KDE 4.11 (Kubuntu 14.04) the whole workspace freezes when debugging GUIs, e.g. Java FX. Only switching to the console and killing the started program makes the desktop responsive again.

Solution: pass the VM argument ''-Dsun.awt.disablegrab=true''.

Source: https://bugs.eclipse.org/bugs/show_bug.cgi?id=20006

Alternative solution: System Settings > Application Appearence > GTK > use "Raleigh" as GTK2 theme

The xfce gtk2 engine should also work (and is less ugly): apt install gtk2-engines-xfce
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