Cutting and pasting a number of components causes duplicate ref designators.
Steps to reproduce bug:
1. Place two components (eg. LEDs). Get for example D1, D2
2. Select both of them
3. Ctrl-C, Ctrl-V
Results:
New diodes are both named D3
Expected results:
New diodes should be named D3, D4
Browser:
Firefox 37.0 in Linux Mint.