add some documentation for future me or other poor people who have to edit the file again ;)

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# Timeline SVG maintenance
The SVG file of the timeline isn't easy to maintain, mainly because of the
appearing bubbles and the links when clicking on an event. This document shall
help you in case you are the poor person having to do that (hi future Me!) ;)
Alert: I'm using a localised version of Inkscape so maybe some labels are
different to your English version.
## Positioning of elements
Inkscape will help you with positioning the various elements correctly. Use the
"Arrange" tool wisely.
To set the events at the correct vertical line, dock it to the inner border of
on of the four the greenish bars, then move it one large (Shift+Arrow) and one
small (Arrow) to the outer side. Don't ask why, but this is how it was invented
(shame on you, past Me!).
## Name scheme
The four bars are internally numbered, from 1 to 4 from left to right. This
will become important when we come to naming the bubbles.
The only elements that need proper naming are the (invisible) bubbles. They
consist of 5 digits: $bar_number $month(2) $year(2)
20815 means: 2nd bar (Policy), 08 2015
## Unhide all bubbles
If you open the file, the bubbles won't be visible and editable. You have to
unhide them first. Mark the "bubbles" layer, go to "Object" in the menu bar and
click "Unhide all". You now see all bubbles at once, overlapping each other.
## Hide bubbles
Click on a bubble and open the "object preferences" (Shift+Ctrl+O). Click on
the "hide" checkbox to make it disappear. To change the visibility status of a
hidden element, you can find it with the search function if you know its name
(look at "name scheme" above). You have to check the "include hidden elements"
box for that.
## Setting links
All items (layer "points") have a link to click on. Just right-click on the
event and click "link preferences" and edit the "Href" attribute. Remember to
set the Target to "_blank" to open a link in a new window when you click on it.
## Hover bubbles
When you hover over an event, it makes a bubble appear - and disappear as soon
as you hover out. This is the trickiest (and most fiddly) part, and needs two
things: a bubble with the correct name, and an event with the current function.
First, give the bubble a proper name, following the "name scheme" from above.
This is tricky because sometimes it selects a single element of the bubble
instead of the whole group (or something). Sometimes I had to make two double
clicks in a row on a bubble to get the correct setting mask. If you copy an
existing bubble, rename it first, then edit it's content! Much easier, trust
After that, go to the respective event for this bubble (I assume you have moved
the bubble to a fitting position). Open the object preferences, click on
"interactivity". If "onmouseover" and "onmouseout" are blank, try to
double-click on the event again, and append a single click. For me this worked.
For your new event, copy the two strings and just update the 5 digits with the
name you gave the bubble. This name has to be unique!
If there are two events from the same month and year in the same bar, append a
"b" to it or something, and reflect this to the onmouseover/-out settings.
After that, just hide the bubble (again). Click on it, open the object's
preferences and mark the hide checkbox.
Hint: If you can't get to the preferences again because you can just select the
bubble's text or something, click the Esc button, or on a different element in
the file. Helps sometimes.
## Publish on website
If you didn't change the page size of the document, you can just commit the new
SVG file. Please remember to export the file to PNG and also commit that. This
is important as a fallback for poor old-IE users and non-Javascript users.
If you changed the size of the page (because you added more years for example),
you may have to edit the source code of the file to make internet browser show
the whole document instead of blank nothing.
Open the SVG file in a text editor and set following values:
viewBox="0 0 $WIDTH $HEIGHT"
You can get the width and height from the document settings in Inkscape. The
100% always stay the same. Of course, "$" will have to be removed.
In the same step you might also want to anonymise the
"inkscape:export-filename" value since it might reveal your name or the folder
naming scheme (FSFE's president might not want you to use
/home/user/shittyFSFEworkCrap/ as the directory name).