A new version of Morphic was added to project The Inbox: http://source.squeak.org/inbox/Morphic-LM.1462.mcz
==================== Summary ====================
Name: Morphic-LM.1462 Author: LM Time: 6 September 2018, 12:14:18.079447 pm UUID: e1c1e0cf-8e19-7e49-99f6-bc98b78ed007 Ancestors: Morphic-cmm.1461
Fixes a NonBooleanReceiver error that appeared when pressing backspace on a read-only text field.
=============== Diff against Morphic-cmm.1461 ===============
Item was changed: ----- Method: TextEditor>>backTo: (in category 'typing support') ----- backTo: startIndex "During typing, backspace to startIndex. If there already is a selection, just delete that selection. Otherwise, check if we did something else than backward-deletion and start a new command if so."
+ morph readOnly ifTrue: [^ false]. - morph readOnly ifTrue: [^ self].
self hasSelection ifTrue: [ "Add checkpoint in undo history." self replaceSelectionWith: self nullText. ^ true].
startIndex > self text size ifTrue: [^ false].
self selectInvisiblyFrom: startIndex to: self stopIndex-1. self isTypingIn ifTrue: [ self history current type = #backward ifFalse: [self closeTypeIn] ifTrue: [ "Accumulate all deleted characters in current undo command." self history current contentsBefore replaceFrom: 1 to: 0 with: self selection. self history current intervalBefore in: [:i | self history current intervalBefore: (startIndex to: i last)]]]. self openTypeInFor: #backward. self zapSelectionWith: self nullText. ^ false!