Text renderer crashes

[Araq]

Select a large block of code, ensure the cursor is not visible, press tab to indent, crash.

Traceback (most recent call last)
nimedit.nim(1177)        nimedit
nimedit.nim(1142)        mainProc
nimedit.nim(1083)        drawAllWindows
nimedit.nim(1019)        draw
drawbuffer.nim(544)      draw
system.nim(3335)         failedAssertImpl
system.nim(3327)         raiseAssert
system.nim(2527)         sysFatal
Error: unhandled exception: false  [AssertionError]