Yes this is what I see too, but it depends …: if for some reason while
my desktop is prepared after logging in something starts using disks
heavily icons will rearrange, even if the system had time to calm down.
Until now the whole system of arranging icons depends on exact:
1. read the positions from
${HOME}/.config/xfce4/desktop/icons.screen0-default.rc
(or if it exists and matches screen width/height:
${HOME}/.config/xfce4/desktop/icons.screen0-<width>x<height>.rc)
2. read directory content from ${HOME}/Desktop while reading rearrange icons to
given positions
If this is not done exactly after each other icons will rearrange. Both
actions are now distinct and started at the same time, running
concurrently. Now just guss what happens, if 2 is ready before 1, or 2
starts, 1 catches up – icons will rearrange completly or partly. Why?
Because reading an item from ${HOME}/Desktop without finding it in
position data structures defaults the position of this item. It will be
placed to the next free, available position. Since all positions are
free until ${HOME}/.config/xfce4/desktop/icons.screen0-default.rc is
read the icon position is located by what you defined as default for the
first one read (0,0) incremented by one position to the right or down
for the next one. If finally
${HOME}/.config/xfce4/desktop/icons.screen0-default.rc is read, all
positions are thrown away, since all icons are arranged already.
Now lets have a look what happens if reading ${HOME}/Desktop starts, but
is caught up by reading
${HOME}/.config/xfce4/desktop/icons.screen0-default.rc: the first few
icons are rearanged, then, since data structures are filled and icons
found these are positioned as given. But only it the position the icon
wants is free. If it is not, this icon goes for the default – finding
the first free place by using what is defined: starting at 0,0,
extending one down filling colums from top left to bottom down.
Next if reading ${HOME}/.config/xfce4/desktop/icons.screen0-default.rc
starts, but is caught up by ${HOME}/Desktop: in this case all icons with
positions in data structures are placed as expected. Then all those not
having positions are placed as defaults define, occupying free places.
All of this is made more complicated as the system immediately stores
"newly" found icon positions to
${HOME}/.config/xfce4/desktop/icons.screen0-default.rc overwriting this
file as often as there are items in ${HOME}/Desktop.
>From this:
1. make sure reading ${HOME}/.config/xfce4/desktop/icons.screen0-default.rc is
complete BEFORE
2. reading any items from ${HOME}/Desktop
and
3. make sure ${HOME}/.config/xfce4/desktop/icons.screen0-default.rc is
never written before all items in ${HOME}/Desktop are read and
positioned.
A simple solution would be to block execution of reading items from
${HOME}/Desktop until
${HOME}/.config/xfce4/desktop/icons.screen0-default.rc is read. And
block writing ${HOME}/.config/xfce4/desktop/icons.screen0-default.rc
while items are read from ${HOME}/Desktop.
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https://bugs.launchpad.net/bugs/1335492
Title:
[4.11.8] Desktop icons rearrange on each login
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