Description of problem:

There is no correct icon shown for qalculate-gtk. Depending on the situation, what is shown is either a generic gear icon or a missing/broken symbol icon.
Cause: the file /usr/share/applications/qalculate-gtk.desktop references its icon as: 
Icon=/usr/share/pixmaps/qalculate.png
but that file doesn't exist (neither on the system nor inside the qalculate-gtk package nor in any other package as far as urpmf would tell.

Instead, the qalculate-gtk package contains a selection of other icon files:
/usr/share/icons/hicolor/128x128/apps/qalculate.png
/usr/share/icons/hicolor/16x16/apps/qalculate.png
/usr/share/icons/hicolor/22x22/apps/qalculate.png
/usr/share/icons/hicolor/24x24/apps/qalculate.png
/usr/share/icons/hicolor/256x256/apps/qalculate.png
/usr/share/icons/hicolor/32x32/apps/qalculate.png
/usr/share/icons/hicolor/48x48/apps/qalculate.png
/usr/share/icons/hicolor/64x64/apps/qalculate.png
/usr/share/icons/hicolor/scalable/apps/qalculate.svg

Version-Release number of selected component (if applicable):


How reproducible:
always

Steps to Reproduce:
1. install qalculate-gtk
2. have a look at its menu entry in lxde start menu: the app's icon there is a generic gear symbol.
3. add it to lxpanel's application launch bar. Here the app's icon is a generic broken/missing symbol