MPS-15540 "Incompatible Target concept in role 'xyz'" error message should be improved
MPS-19942 [build:MPS-135.998] Can't find updated anchor cell. Node: <no variableDeclaration>, anchorCellID: property_name: Can't find updated anchor cell. Node: <no variableDeclaration>, anchorCellID: property_name
MPS-17149 Pressing Ctrl-Space at the end does not work
MPS-19994 Invalid node message
Merge remote-tracking branch 'origin/MPS3.1' into 3.1/editorUsability
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- updating editor frameworkin order to always differentiate between DELETE & BACKSPACE
- updating cell factories code to attach same action as DELETE & as BACKSPACE
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- modifying editor generator in order to attach same action as DELETE and BACKSPACE handler for the created cell
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- regenerating all editors
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- in the code written in MPS using same actions for DELETE and BACKSPACE handling
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- updating editor generator preprocessing script in order to automatically insert BACKSPACE ActionMapItem (action handler) same as DELETE one if DELETE ActionMapItem was specified, but BACKSPACE ActionMapItem was not. This is a modification probably necessary for compatibility reasons and should be removed in future.
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- regenerating all editors
MPS-17777 Better distinguish between the DELETE and BACKSPACE action events
- correcting some unit-tests.
MPS-19942 [build:MPS-135.998] Can't find updated anchor cell. Node: <no variableDeclaration>, anchorCellID: property_name: Can't find updated anchor cell. Node: <no variableDeclaration>, anchorCellID: property_name
- processing model modifications for all deleted nodes on updating editor after receiving SModelChildEvent which has .isRemoved() == true
Merge remote-tracking branch 'origin/MPS3.1' into 3.1/editorUsability
Merge remote-tracking branch 'origin/MPS3.1'

Conflicts:
	editor/editor-runtime/source/jetbrains/mps/nodeEditor/cells/EditorCell_Label.java
	languages/languageDesign/behavior/languages/behavior/source_gen/jetbrains/mps/lang/behavior/editor/ConceptBehavior_Editor.java
	languages/languageDesign/behavior/languages/behavior/source_gen/jetbrains/mps/lang/behavior/editor/StaticConceptMethodDeclaration_Editor.java
	languages/languageDesign/structure/source_gen/jetbrains/mps/lang/structure/editor/AbstractConceptDeclaration_deprecatedStuff.java