fdo#85858: svx: fix mouse dragging of table row separators in Writer

Add a work-around for Writer's usage of LONG_MAX to SvxColumnDescription:
on 64-bit platforms the LONG_MAX added in SwView::StateTabWin() for
SID_RULER_ROWS will overflow in vcl's LogicToPixel mapping and that
causes wrong positioning of the row highlight lines.

Probably Writer should use something other than LONG_MAX (no reason why
these types need to be bigger than 32-bit anyway) but that needs a
bigger cleanup.

(regression from 4c60f722af)

Change-Id: I08147462356368d48959a85a85ef7dd8dcae0943

svx/source/dialog/rulritem.cxx

@@ -670,8 +670,9 @@ SvxColumnDescription::SvxColumnDescription(long start, long end, long endMin, lo
     nStart   (start),
     nEnd     (end),
     bVisible (bVis),
-    nEndMin  (endMin),
-    nEndMax  (endMax)
+    // fdo#85858 hack: clamp these to smaller value to prevent overflow
+    nEndMin(std::min<long>(endMin, std::numeric_limits<unsigned short>::max())),
+    nEndMax(std::min<long>(endMax, std::numeric_limits<unsigned short>::max()))
 {}
 
 bool SvxColumnDescription::operator==(const SvxColumnDescription& rCmp) const