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Hit CMD I (Mac) a few times in a row (rapidly):
System.NullReferenceException: Object reference not set to an instance of an object
at Mono.TextEditor.HeightTree.LogicalToVisualLine (Int32 logicalLine) [0x00009] in /Users/builder/data/lanes/monodevelop-mac-master/aea1769d/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/HeightTree.cs:343
at Mono.TextEditor.TextEditorData.LogicalToVisualLine (Int32 logicalLine) [0x00000] in /Users/builder/data/lanes/monodevelop-mac-master/aea1769d/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/TextEditorData.cs:1373
at Mono.TextEditor.TextEditor.UpdateAdjustments () [0x00000] in /Users/builder/data/lanes/monodevelop-mac-master/aea1769d/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextEditor.cs:1651
at Mono.TextEditor.TextEditor.OnExposeEvent (Gdk.EventExpose e) [0x0000d] in /Users/builder/data/lanes/monodevelop-mac-master/aea1769d/source/monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextEditor.cs:1665
at Gtk.Widget.exposeevent_cb (IntPtr widget, IntPtr evnt) [0x00000] in <filename unknown>:0
Leaving as normal because the repetition rate needed to experience the issue is high.
Whoops. I mean Control + I (whatever your keybinding is for 'Format Document')
The height tree from master doesn't do that - I backported it to the branch.