close all data sources not closing all sources

[Andreas Janz]

selecting all sources (Strg+a) and click the "remove" button, is not removing all sources

there is another problem with the "remove" button: if it is disabled and I select all sources (Strg+a) it stays disabled.

[Benjamin Jakimow]

That's because in this example 3 group nodes are selected, but none of the Data source nodes itself. I'll change this to remove all data sources of selected data source groups.

[Benjamin Jakimow]

closes issue #253

→ <<cset 549a08f74fc9>>

[Benjamin Jakimow]

closes issue #253

→ <<cset 549a08f74fc9>>