Repeat thead and tfoot when table contains page breaks

This has been done a few times before[0][1], but seems to be broken
again as reported in [2].

This commit is only reinstating what's missing from [1]. This was done
by running:

    git log -p -1 2d778f6 | git apply -3 -p6 --directory=src/qt/qtwebkit

And resolving the conflicts. There are still some compile errors. These
will be fixed in the upcoming commits instead of in this one to clarify
the changes.

[0]: ariya#211
[1]: ariya#344
[2]: ariya#13324

src/qt/qtwebkit/Source/WebCore/rendering/RenderTable.cpp

@@ -670,7 +670,59 @@ void RenderTable::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffs
  child->paint(info, childPoint);
  }
  }
-
+
+ bool repaintedHead = false;
+ IntPoint repaintedHeadPoint;
+ bool repaintedFoot = false;
+ IntPoint repaintedFootPoint;
+ if (view()->pageLogicalHeight()) {
+ // re-paint header/footer if table is split over multiple pages
+ if (m_head) {
+ IntPoint childPoint = flipForWritingMode(m_head, IntPoint(tx, ty), ParentToChildFlippingAdjustment);
+ if (!info.rect.contains(childPoint.x() + m_head->x(), childPoint.y() + m_head->y())) {
+ repaintedHeadPoint = IntPoint(childPoint.x(), info.rect.y() - m_head->y());
+ repaintedHead = true;
+ dynamic_cast<RenderObject*>(m_head)->paint(info, repaintedHeadPoint.x(), repaintedHeadPoint.y());
+ }
+ }
+ if (m_foot) {
+ IntPoint childPoint = flipForWritingMode(m_foot, IntPoint(tx, ty), ParentToChildFlippingAdjustment);
+ if (!info.rect.contains(childPoint.x() + m_foot->x(), childPoint.y() + m_foot->y())) {
+ // find actual end of table on current page
+ int dy = 0;
+ const int max_dy = info.rect.y() + info.rect.height();
+ const int vspace = vBorderSpacing();
+ for (RenderObject* section = firstChild(); section; section = section->nextSibling()) {
+ if (section->isTableSection()) {
+ if (toRenderBox(section)->y() > max_dy) {
+ continue;
+ }
+ int i = 0;
+ for(RenderObject* row = section->firstChild(); row; row = row->nextSibling()) {
+ if (!row->isTableRow()) {
+ continue;
+ }
+ // get actual bottom-y position of this row - pretty complicated, how could this be simplified?
+ // note how we have to take the rowPoint and section's y-offset into account, see e.g.
+ // RenderTableSection::paint where this is also done...
+ IntPoint rowPoint = flipForWritingMode(toRenderBox(row), IntPoint(tx, ty), ParentToChildFlippingAdjustment);
+ int row_dy = rowPoint.y() + toRenderBox(row)->y() + toRenderBox(row)->logicalHeight() + toRenderBox(section)->y();
+ if (row_dy < max_dy && row_dy > dy) {
+ dy = row_dy;
+ } else if (row_dy > max_dy) {
+ break;
+ }
+ i++;
+ }
+ }
+ }
+ repaintedFoot = true;
+ repaintedFootPoint = IntPoint(childPoint.x(), dy - m_foot->y());
+ dynamic_cast<RenderObject*>(m_foot)->paint(info, repaintedFootPoint.x(), repaintedFootPoint.y());
+ }
+ }
+ }
+
  if (collapseBorders() && paintPhase == PaintPhaseChildBlockBackground && style()->visibility() == VISIBLE) {
  recalcCollapsedBorders();
  // Using our cached sorted styles, we then do individual passes,
@@ -681,6 +733,12 @@ void RenderTable::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffs
  m_currentBorder = &m_collapsedBorders[i];
  for (RenderTableSection* section = bottomSection(); section; section = sectionAbove(section)) {
  LayoutPoint childPoint = flipForWritingModeForChild(section, paintOffset);
+ // also repaint borders of header/footer if required
+ if (section == m_head && repaintedHead) {
+ childPoint = repaintedHeadPoint;
+ } else if (section == m_foot && repaintedFoot) {
+ childPoint = repaintedFootPoint;
+ }
  section->paint(info, childPoint);
  }
  }