Center tab labels as though there is no close button. If the label is so long that it would overlap the close button, left align it just after the close button. Issue 4915.

When arranging windows horizontally, wait for all windows to exit fullscreen first. This requires queuing up toggle fullscreen operations, so the iTermFullScreenWindowManager got revamped to handle this.

Make checkmarks in scheme selection box reflect reality (including whether the system considers us the default app). Remove some legacy iterm2 scheme code.

Fix a crash where some preference panel view controllers remained allocated after the pref panel was released. There were cyclic references in various blocks. The fix for most of them is to remove the blocks in PreferenceInfo when the window closes. A color well block also had a cycle, and I fixed it by using an unsafe unretained pointer. Blocks are non-arc code are scary.

Avoid recomputing window occlusion fraction by caching it and invalidating the cache when windows move, create, are destroyed, or change order. Issue 4893.

Clean up iTermWarning so you can provide a block for each action. Use the new API in the mutiline paste warning. Fix a bug where it did not offer to paste without nesline when not at a shell prompt.

When the terminal is untrusted show a buster sign for images instead of silently swallowing the escape sequence.

Improve performance when doing word selection. Reduce the longest word findable by smart selection in word selection mode to 1000 bytes. Do not try to do word selection in smart selection when an action is required (this greatly speeds up pressing cmd while hovering over a long line). Optimize how word strings are found when building up a string by enumerating backwards from the cursor position.

Fix a bug with focus follows mouse where the window whose textview was under the cursor would be made key, even if a higher-ordered window was under the cursor (just not the textview part). Issue 4833.

Merge ronyfadel's change that delays creating the prefs panel until it's needed and releases it when it's closed. Originated in PR 275.

Change permissions of paste history to remove user and all readability. Update text for paste history size advanced preference.

Don't erase hotkey window restorable state after iTermController has been released. This prevented the hotkey window from being restored on update. Fixes issue 4838.