gnachman/iTerm2 — pull request #115 by simonair (2013-02-14 15:18:51+00:00)
Title: If ComplexCharToStr returns nil, set drawable = NO

This does not fix the issue of not checking whether a unicode code point
is actually drawable, but it avoids the following assertion:

Assertion failed: (growBy > 0),
function -[SharedCharacterRunData growAllocation:by:],
file /Users/georgen/v2/SharedCharacterRunData.m,
line 74.

This assertion fails when attaching to a previously detached tmux
session that has multiple horizontal and vertical splits with

tmux -C attach

The assertion did not fail in all cases, but often enough to make
tmux integration unusable.