#2135 No longer possible to add key-mappings

[Johan]

OS X : v10.12.4 and Debian 8
TexStudio: v2.12.4

Summary:
Prior to 2.12.4 it was possible to add a new key-mapping by opening the preferences and click the "add row" button on the shortcut pane. However from 2.12.4 this no longer works.

It is possible to add a new row but it is not possible to change the new (empty) key mapping to
something useful. Double clicking now only gives the message To change shortcut, edit the column "Current shortcut" or "Additional shortcut

For Linux/(Debian) based system this is especially irritating since by default there are no key mappings
for the common "Move to end of line" or "Move to beginning of line" commands.

How to repeat.
1. Open preferences->Shortcuts
2. Expand tree node "Basic Key Mapping"
3. Double click the "add row" button at end of list of mappings
4. Try to add a new key-mapping by double-clicking the very left column on the new line

Expected behaviour.
That it is now possible to double click on the new and empty row to add a new key-mapping

Actual behavior.
The empty row is added but it is not possible to actually enter the name of a new key-mapping

[Jan Sundermeyer]

fixed