[Libreoffice-bugs] [Bug 32186] New: Button background for GTK style is wrong in some cases

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=32186

           Summary: Button background for GTK style is wrong in some cases
           Product: LibreOffice
           Version: LibO 3.3.0 Beta3
          Platform: All
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: UI
        AssignedTo: libreoffice-bugs at lists.freedesktop.org
        ReportedBy: b7.10110111 at gmail.com


Created an attachment (id=40872)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=40872)
Screenshot

Currently, buttons are drawn on a background to take alpha-enabled buttons into
account. Here's how it's done
(clone/libs-gui/vcl/unx/gtk/gdi/salnativewidgets-gtk.cxx" line 1225):

// Buttons must paint opaque since some themes have alpha-channel enabled
buttons
gtk_paint_flat_box( gWidgetData[m_nScreen].gBtnWidget->style, gdkDrawable,
GTK_STATE_NORMAL, GTK_SHADOW_NONE, &clipRect, m_pWindow, "base", x, y, w, h );

This fails for themes with non-white background. In this case a rectangle of
non-background color is seen around the button on the startup window, as in the
screenshot attached. Of course, this looks ugly.
A fix would be to trigger native repaint of background before drawing the
button instead of calling gtk_paint_flat_box().

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