I can't delete a KDE4 widget

Last week I installed Furius Weather, a cool widget for KDE4 that displays the weather in your preferred location. This widget, though, is not perfectly integrated in the KDE4 plasma, and for example you can't add it to the task bar at the bottom, or at least I didn't manage to do it.

I tried to add it by following the usual procedure: select "Add widgets" on right-click at the desktop, and then drag the entry for Furius weather to the bar. When I did that, a dialogue appeared that prompted for a theme. I selected my default theme which I had downloaded from Furius Weather. To my horror I saw that the default theme uses large icons which did not fit on the task bar.

I tried to delete the widget using the usual way: select "Add widgets" and click on the star next to Furius Weather, but nothing happened. Actually, I don't know how I ended up having three instances in my task bar! See the image. Now I had almost no space for anything else in the bar.

Today, finally I found the solution. You need to edit the file ~/.kde4/share/config/plasma-appletsrc. In the file I found 18 references to FuriusWeather! I guess that was how many times I added the widget and tried to delete it. I removed all references, restarted the window manager (ALT CTRL <-; don't just log out or restart the computer or KDE will overwrite your modifications), and the desktop came back clean.

Wonderful!