Small Bug: double click to change name replaces name.

[wilcooo]

To reproduce this problem:

1. have (at least) two files opened, so that the sidebar appears.
2. double click the first file name, in order to enter the name-changing mode. However, don´t change the name.
3. without canceling the first name-change, double click the second file name.

The second file's name will now get replaced by the first file's name.