Bug#853471: Patch to fix GCC 7 build

[Johannes Brandstätter <jbrandst@2ds.eu>]

tags 853471 + patch
thanks

The attached patch fixes build issues with GCC 7.

--- a/part/search/kateregexp.cpp
+++ b/part/search/kateregexp.cpp
@@ -96,7 +96,7 @@
 
         case L'n':
           stillMultiLine = true;
-          // FALLTROUGH
+          __attribute__((fallthrough));
 
         default:
           // copy "\?" unmodified
@@ -164,7 +164,7 @@
 
         case L'n':
           stillMultiLine = true;
-          // FALLTROUGH
+          __attribute__((fallthrough));
 
         default:
           // copy "\?" unmodified
--- a/part/view/kateview.cpp
+++ b/part/view/kateview.cpp
@@ -310,7 +310,7 @@
   if (factory())
     factory()->removeClient (this);
 
-    KTextEditor::ViewBarContainer *viewBarContainer=qobject_cast<KTextEditor::ViewBarContainer*>( KateGlobal::self()->container() );
+  KTextEditor::ViewBarContainer *viewBarContainer=qobject_cast<KTextEditor::ViewBarContainer*>( KateGlobal::self()->container() );
     if (viewBarContainer) {
      viewBarContainer->deleteViewBarForView(this,KTextEditor::ViewBarContainer::BottomBar);
       m_bottomViewBar=0;
--- a/part/view/kateviewaccessible.h
+++ b/part/view/kateviewaccessible.h
@@ -248,7 +248,8 @@
 
         virtual int navigate(QAccessible::RelationFlag relation, int entry, QAccessibleInterface **target) const
         {
-            if ((relation == QAccessible::Child || QAccessible::FocusChild) && entry == KateCursorAccessible::ChildId) {
+            if ((relation == QAccessible::Child || relation == QAccessible::FocusChild) &&
+                    entry == KateCursorAccessible::ChildId) {
                 *target = new KateCursorAccessible(view());
                 return KateCursorAccessible::ChildId;
             }
--- a/part/view/kateviewhelpers.cpp
+++ b/part/view/kateviewhelpers.cpp
@@ -1703,7 +1703,7 @@
       if (realLine > -1) {
         if (m_viewInternal->cache()->viewLine(z).startCol() == 0) {
           if (m_viRelLineNumbersOn && m_view->viInputMode()) {
-            int diff = abs(realLine - currentLine);
+            int diff = abs(static_cast<int>(realLine - currentLine));
             if (diff > 0) {
               p.drawText( lnX + m_maxCharWidth / 2, y, lnWidth - m_maxCharWidth, h,
                           Qt::TextDontClip|Qt::AlignRight|Qt::AlignVCenter, QString("%1").arg(diff) );