Delete whitespace intelligently or backspace by indentation, e.g. delete four spaces that function as 'a tab'

[kenny-evitt]

See LightTable/LightTable#548 for the original issue. The original comment:

So currently, if I configure LT to insert spaces rather than tabs, what happens when I try to delete the spaces is that I have to delete the spaces one by one, rather than deleting them as tabs (delete 4 spaces at once in my case). Could LT intelligently detect when I want to delete a tab width of spaces?

[cldwalker]

From LightTable/LightTable#548: Open to a pull request on Python plugin that does this. CodeMirror provides indentLine which provides a "subtract" to do this. The keybinding would need to be bound to backspace, scoped to just python files and map to a command that does something like the following (haven't tested it in a python file):

(let [ed (pool/last-active)]
      (.indentLine (editor/->cm-ed ed) (.-line (editor/cursor ed)) "subtract" true))