tree 1c528d7e620547fa26704577af3330188154ba46
parent d3a47e14e5ebf7a4d8ca8c9a3dfe748b93d3663a
author Russ Cox <rsc@swtch.com> 1417482952 -0500
committer Russ Cox <rsc@swtch.com> 1417483120 +0000

libdraw, libframe, acme: fix, guard against inverted range in textsetselect

Credit to Roi Martin <jroi.martin@gmail.com> for noticing that
libdraw was being passed a negative string length and for finding the
sequence of keystrokes that make acme do it reproducibly.

Change-Id: If3f3d04a25c506175f740d3e887d5d83b5cd1bfe
Reviewed-on: https://plan9port-review.googlesource.com/1092
Reviewed-by: Russ Cox <rsc@swtch.com>