Fix a crash on launch bug where a selection could have a negative endpoint, causing us to look up a long-gone line. Presumably this occurs because of the 10k line cap on session restoration.

Fix a bug where selection length was not calculated correctly. This affected various optimizations that disable features for long selections. If the column window was not set then a length of up to the grid width (but not greater) was returned.

Allow services that receive text input if up to 10k lines are selected. There has to be a limit because services grab the contents before you know they're needed, at the time the context menu opens. Issue 6218

A single click on the key icon (shown when at a password prompt on localhost) opens the password manager

Rename lastDirectoryIsRemote to lastDirectoryisUnsuitableForOldPWD and add some comments. I always find this code hard to analyze.

Initial text automatically gets a newline sent, so remove the one that used to be added when executing a script.

Issue 6067

Add an advanced pref to use the "correct" algorithm for computing line height, which involves magic incantations. It produces better results for Input Mono Condensed and seems to match what Terminal does. Issue 6159.

Also removed some unneeded baseline offset plumbing.

Don't make tabs change the background or foreground color of the uninitialized cells they skip over. Issue 6193

Set SUFeedURL in Info.plist. Sometimes Sparkle doesn't see the user defaults key and then dies because it lacks a URL. The down side of this is that beta users may not pull from the beta track and the experiment bucket will get more than its fair share of requests on the stable track. But it beats the heck out of crashing for no reason.

Analysis here:

https://github.com/sparkle-project/Sparkle/issues/1139

Add "check for updates" to menubar icon

Disable tabbing completely. The user defaults hack isn't sufficient because holding down option causes a new window to open as a tab. Issue 6197

Add a beta build configuration, and use it for betas. Change beta, debug, and nightly build configurations to set the preprocessor BETA=1. Add ITBetaAssert, which crashes only in those build configurations. Add some ITBetaAsserts to find why we sometimes try to get negative line numbers.

Prevent calls to retainWindow:withTab with a nil tab, which apparently happens although I don't know how or why. There was a crash log.

Remove some weird logic dating back to commit ee11b549068742112b4d7e3141a9eeece81aa50f in the old-iterm repo that was supposed to "improve function key handling" and made Fn+Ctrl+key send the key ignoring modifiers and Fn+key (without Ctrl) send the key with modifiers, as though Fn weren't pressed. I have no idea what this was meant to do but it caused issue 6176

Reset user scroll when the buffer is cleared. Change the convenience accessor for verticalScroller to ptyVerticalScroller since in xcode 9 you can no longer override a superclass method and change the return type to a subclass of the method's original return type. Issue 6174

Add iTermCallWithTimeout since 10.13 has a lot of system calls that never return. Prevent proc_pidinfo for hanging for more than half a second.

Update colorpicker to use latest project settings and warnings. Fix a bug where the eyedropper window is never hidden on 10.13. Issue 6171

When the autocomplete window opens and then discovers it has no results and closes it causes a nonpinned hotkey window to close because the window gets closed before becoming key. That confuses the very complex logic for autohiding. To make the smallest possible change, I do a dispatch async on the close to order it properly. Issue 6169.

Prevent statfs from hanging the app for more than half a second in the face of broken network filesystems. Issue 6110

Don't set desiredRows_/desiredColumns_ when adding a tab to an existing window. It should stay at the value set by the first tab. Issue 6141.

Fix warnings introduced in Xcode 9

Fix vertical alignment of 'Paste' button in advanced paste.

actually allows this if screens don't have their own spaces. Issue 6125

This fixes both deadkeys alone (e.g., ` on a DE keyboard) or deadkey+key (opt+` on DE to give '). I tested migration from 3.0 and it seems fine.