Version: 2.2 (using Devel)
kruler shown vertically shows the usual ruler (I used before KDE 4.6.5, now 4.8-RC1).
When I middle-click the ruler to have it horizontally, it now fills the complete screen.
Steps to Reproduce:
ruler shall only be as high when used horizontally as it is wide when shown vertically
OS: Linux (i686) release 126.96.36.199-0.4-desktop
Not reproducable here.
You do know that you can resize the ruler, for example using the ALT+LMB trick?
Hmmm ... veeerryy strange! I can not reproduce it either now.
I had it acting like this yesterday every time I middle-clicked it.
And yesterday I also could not change the length - it always stayed as wide as my screen ...
Let's close it then.
Could you check your kwin settings?
In the Window Behavior, tab actions; middle button may go to maximize.
Either way, closing sounds fine :)
Middle-click setting is still set to Shade. I did not change the setting when updating to 4.8.rc1.