Detect whether file uses tabs/spaces when it loads, using the user preference as a default [$75]

[Claire Charron]

Take a look at what Geany does for an example.

Basically, detect the type of indenting for each file and use that whenever the user presses the tab key. For new files, default to what the user has set.

[Sergey "Shnatsel" Davidoff (shnatsel)]

Yup, auto-detecting coding style will be great. I'm sure I've requested that already, but I can't find the bug report.

[Cody Garver (codygarver)]

This bug has a bounty on it: https://www.bountysource.com/issues/1423121-detect-whether-file-uses-tabs-spaces-when-it-loads-using-the-user-preference-as-a-default

[The Lemon Man (lemonboy)]

Gah, I had linked the branch to the wrong ticket.

[Lewis Goddard (lewisgoddard)]

Some files I edit appear in the format:

1. Tabs for indentation
2. Spaces for

_TAB_ <meta name="title" _SPACES_ content="...
_TAB_ <meta name="description" _SPACES_ content="...

Will these be correctly detected by this branch, even if tabs do not appear first?

[Lewis Goddard (lewisgoddard)]

I assume is should only consider whitespace on the leading edge of a line.

[Lewis Goddard (lewisgoddard)]

1. Files using spaces.
2. Files using tabs.
3. Files using tabs for indentation, but then multiple spaces for formatting.