Hi,
Review comments:
1) I see the font used for class .query-history .entry is monospace, shouldn't it be Helvetica as per style guide ? the font for Messages > text is also monospace.
2) Can 1px top border be added above first entry in left panel to differentiate from above panels ?
3) No query execution message appears if i run same query second time, please refer screenshot.
Apart from this patch looks good.
Thanks,
Surinder