[Bug 39051] New: TabbedTextOut() incorrect output on tab character

https://bugs.winehq.org/show_bug.cgi?id=39051

Bug ID: 39051
           Summary: TabbedTextOut() incorrect output on tab character
           Product: Wine
           Version: 1.7.29
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: P2
         Component: user32
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 52021
  --> https://bugs.winehq.org/attachment.cgi?id=52021
testcase (tto.exe) and files to build it

Tab characters do not output correctly when they are output one at a time. 
This is much worse using a memory device context than a screen device context.

Attached is a testcase.  It outputs text to a window using 2 different methods.
 Clicking in the client area toggles the method.  When iterating over each
character, TabbedTextOut() produces apparently garbage from the previous line
instead of filling the rectangle appropriately as windows does.  When drawing
the line in a single call, the behavior is as expected.  Spaces do not suffer
from this problem (illustrated also by the testcase).