Do not draw if the datasource width is negative. Tries to work around a crash pending the root cause's discovery.

Validate hostname of ssh URLs and reject anything besides letters, numbers, dash, and colon. Colon is allowed for IPV6. Square brackets in IPV6 get stripped by the system.

Updates for XCode 8.3: fix some nullability warnings and tell Travis to use XCode 8.3. Golden images are broken again.

Update API docs and python examples to use more modern conventions: print as a function, virtualenv as an option.

Also stop recommending that people run pip as root and instead just use
virtualenv.

Enable precise timers so beta users can give better feedback reports on drawing performance. I expect a less than 1% performance hit from this.

Cache adaptive framerate settings to avoid expensive AdvancedSettingsModel lookups in a frequently called method

Fix bug with signal handling in catch.c

Fix a bug where double-tap of a modifier didn't work unless a hotkey keypress was also defined. This revealed a bug in how weak references were used. isEqual: uses pointer equality by default, so it doesn't work on arrays of weak refs. I hacked around it by implementing isEqual: for the one class I care about.

Signal handlers might be called repeatedly. As such they can't call
non-async-safe functions such as printf. Instead set a sentinel and
check for it.

Release URL codes when they're no longer needed. A mark is placed at the beginning and end of the URL. The one at the beginning is needed to keep the reference count to the code around until the one at the end is added. These marks are saved and restored.

More OSC 8 changes: use colons to delimit params and hover adjacent links together if their URLs and IDs are equal, or if the URLs are equal and the IDs are both unspecified.

profiles are sensible.

Add more logging to track down the source of mysterious drags. Seems they're not being started through the expected code path that takes minimum distance into account.

Update OSC 8 to require parameters prior to the URL. A difference in parameters prevents hover-underlining together.

The new syntax is:

OSC 8 ; params ; url ST

params are (for now) space delimited ASCII and may not contain a ;.
url is a URL. I'm more accepting that I have to be and will take UTF-8 encoded URLs that aren't properly percent-escaped.

Auto hide find cursor window when the session that created it ceases to be first responder. Issue 5637

Add crashlog messages to pinned messages so that you can create a debug log to report issues like the tab bar going bonkers.

Get rid of a gross hack when dragging the only tab in a window. We used to move the window to a hopefully offscreen coordinate of -10000,-10000. That's not guaranteed to work and is silly. Instead, order it out. This tickled another design issue where a placeholder cell was removed while it still had a tracking rect. This commit prevents that crash by first removing the tracking rect.