Some editors allow tabs to be draw different from just the regular "arrows". This patch addes 2 new API messages that get/set the tab draw mode. There is currently 2 ways of drawing them. The "long arrow" which is the normal/default way, and as a "strike out" which is a single horizontal line (like the arrow but with no arrow head). This is how Sublime text does and maybe others. Someone could also add a new mode like "short arrows" like what MSVC uses.
The default (long arrow):
And strike out:
This patch also does a slight bit of renaming, for example "DrawTabArrowFn" is now "DrawTabFn" since tabs don't technically have to be arrows.
Feedback and/or renaming suggestions welcome.
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