[Bug 38823] New: Sumatra PDF 3.0: tabs don't work correctly

https://bugs.winehq.org/show_bug.cgi?id=38823

Bug ID: 38823
           Summary: Sumatra PDF 3.0: tabs don't work correctly
           Product: Wine
           Version: 1.7.45
          Hardware: x86
               URL: https://kjkpub.s3.amazonaws.com/sumatrapdf/rel/Sumatra
                    PDF-3.0-install.exe
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

to reproduce, install Sumatra PDF 3.0 in a clean prefix using the default
options.

then, in wincfg, either turn off "Allow the windows manager to decorate the
windows" or turn on "Emulate a virtual desktop", so that the tab area isn't
cropped.

then click on the menu button, choose File > Open... and open a bunch of files
(10 is a good number).

each file is opened in a tab. cycling through the tabs with the keyboard works
perfectly (Ctrl-Tab and Ctrl-Shift-Tab). however, the tabs aren't handling
mouse events properly.

if we number the tabs 0,1,2,3... then two things become apparent:
-- odd numbered tabs don't seem to respond to mouse events at all.
-- hovering/clicking tab 2*n will highlight/activate tab n, e.g., clicking tab
6 activates tab 3.

the program is open source and the code is avilable here:
https://github.com/sumatrapdfreader/sumatrapdf