0.21.1

This release includes minor bug fixes and new features.

Bugs Fixed

• renderer may crash when null code block item is added
• index out of bounds when selection is between CR and LF
• CharArrayWrapper#subSequence refers to wrong text start
• text wrongly inserted between CRLF
• editor is still listening to text changes after release, causing memory leaks
• occasional index out of bounds when measuring text in GraphicTextRow

Improvements

• EditorReleaseEvent is added, allowing you to do some cleanup on destruction
• add ContentIO for creating/saving Content texts
• add strikethrough color in scheme
• simplify composing text update as insertion or deletion if possible (#357)
• signature help window for lsp (by @dingyi222666 )
• add ThemeModel#isDark for lsp (by @dingyi222666 )

Notes

ContentReader should be migrated to ContentIO. ContentReader will be removed in future.