drop unused button mask enum

Change-Id: Id94c6ecdfc642888eea8c13e55d38326b2d7ad12
Reviewed-on: https://gerrit.libreoffice.org/50145Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

compilerplugins/clang/unusedenumconstants.writeonly.results

@@ -3302,12 +3302,8 @@ include/tools/datetime.hxx:34
     enum DateTime::DateTimeInitSystem SYSTEM
 include/tools/datetime.hxx:39
     enum DateTime::DateTimeInitEmpty EMPTY
-include/tools/errinf.hxx:44
-    enum ErrorHandlerFlags ButtonsOkCancel
 include/tools/errinf.hxx:47
     enum ErrorHandlerFlags ButtonsYesNo
-include/tools/errinf.hxx:48
-    enum ErrorHandlerFlags ButtonsYesNoCancel
 include/tools/inetmsg.hxx:66
     enum InetMessageMime VERSION
 include/tools/inetmsg.hxx:67

include/vcl/errinf.hxx

@@ -78,11 +78,9 @@ enum class DialogMask
     ButtonsOk               = 0x0001,
     ButtonsCancel           = 0x0002,
     ButtonsRetry            = 0x0004,
-    ButtonsOkCancel         = 0x0003,
     ButtonsNo               = 0x0008,
     ButtonsYes              = 0x0010,
     ButtonsYesNo            = 0x0018,
-    ButtonsYesNoCancel      = 0x001a,
 
     ButtonDefaultsOk        = 0x0100,
     ButtonDefaultsCancel    = 0x0200,

svtools/source/misc/ehdl.cxx

@@ -55,12 +55,8 @@ static DialogMask aWndFunc(
     MessBoxStyle eBits = MessBoxStyle::NONE;
     if ( (nFlags & (DialogMask::ButtonsCancel | DialogMask::ButtonsRetry)) == (DialogMask::ButtonsCancel | DialogMask::ButtonsRetry))
         eBits = MessBoxStyle::RetryCancel;
-    else if ( (nFlags & DialogMask::ButtonsOkCancel) == DialogMask::ButtonsOkCancel )
-        eBits = MessBoxStyle::OkCancel;
     else if ( (nFlags & DialogMask::ButtonsOk) == DialogMask::ButtonsOk )
         eBits = MessBoxStyle::Ok;
-    else if ( (nFlags & DialogMask::ButtonsYesNoCancel) == DialogMask::ButtonsYesNoCancel )
-        eBits = MessBoxStyle::YesNoCancel;
     else if ( (nFlags & DialogMask::ButtonsYesNo) == DialogMask::ButtonsYesNo )
         eBits = MessBoxStyle::YesNo;