Add an advanced pref to control which pane is focused on split pane when using focus follows mouse. Issue 5780

Fix leak of password manager sheet window. Also add advanced pref to disable its animation. Issue 5794

Prepare to store the tmux integration profile in the tmux controller. This allows each tmux session to use a different profile. This is a step toward making every pane able to use a different profile (but the same font, of course).

The change is hidden behind an advanced pref which is off by default.

It also fixes a bug where a new tmux tab in a fullscreen window when legacy scrollbars are enabled might have the wrong size.

Name auto session logs with a format defined by an advanced prefs taking values from the session variables.  Issue 1695.

Add an experimental feature to draw an outline around underline and vertical bar cursors to improve distinction from text. Suggested in issue 4614.

Add an off-by-default experimental feature to use GCD to run the updateDisplay timer. Because we use dispatch_async to kick off token execution, and that does not run in a runloop, it can starve a repeating NSTimer like the one that calls updateDisplay. That keeps the display from updating at a regular cadence when there are a lot of tokens. This is the case when scrolling through source code in nvim. Sometimes you see ~400ms gaps between redraws but it's very busy executing tokens. For some reason events like keydown do get a chance to run, but not NSTimer. Issue 5601.

Add an advanced setting to exclude background colors from copied styles. Brought up by a comment in issue 3570.

For the modifier+number shortcuts to switch tab/window/pane, use virtual key codes instead of the event's characters or charactersIgnoringModifiers. For some keybord layouts like AZERTY you must hold down shift or capslock to enter a digit. The feature is inaccessable on such keyboards because we require the modifier mask be an exact match. This is guarded by an advanced setting since it could block user-defined shortcuts. Issue 5573.

Show an announcement when a session restored from an arrangement can't find the profile associated with it. Issue 4740

Add the zippy text drawing algorithm which tries to use the fastpath even for nonascii text. It falls back to core text if a glyph is missing. If ligatures are enabled, zippy won't be used.

Advance the cursor on Zero Width Space for compatibility with Terminal.app, Konsole, and xterm. Adds an advanced pref to control this weird behavior. Issue 5397.

Add advanced pref so broadcasting input also broadcasts cmd-+ and - font size changes. Off by default. Issue 5388.

Make window title bars dark when using the dark theme, by default. Controlled by an advanced preference. Issue 5255.

Add an on by default experimental option to use Core Animation layers. On my iMac, this gives a dramatic speedup (from 15 to 30 fps on my vimdiff benchmark).

iTerm2 with a script. Issue 5288.