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• IME issue: select and type with IME will crash the editor ianstormtaylor/slate#3374 (this solves the issue but introduces another)

• IME issue: type with IME when placeholder exists will crash the editor

• Mark issue: Editor.addMark incorrectly applies marks when hanging-cursor happens

• Mark issue: Editor.removeMark with firefox...

• Cursor issue: When deleting (backward) the first letter with some marks on it, the cursor will jump to the previous block element

• Double-click will select the next void block element (the focus's offset is 1), and then convert the selected content to a block element will crash the editor (safari does not have this problem) - ianstormtaylor/slate#3374

• Double-click will select the next block element in chrome and safari (firefox has done a good job)

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