tdf#92903 KDE4: fix listbox regression from 92115

So at least in case of the CTRL_LISTBOX, getNativeControlRegion is
called for a type and part unsupported by IsNativeControlSupported.

For whatever reason, this results in broken listboxes drawn in
Base's "Table Design" dialog, when selecting "field type", which
draws the listbox on top of the cell.

To make it worse, it seems the listbox is actually drawn to a
smaller space then the actual requirement. Appearently it seems to
use the content rect, instead of the bounding rect.

So in addition to fixing the drawing, this patch increases the
listbox bounding rect, which looks too large in normal dialogs, but
makes the Base's listbox better readable.

Change-Id: I112ec038fd20ad33facd260d16b5d68b508d2bd0
Reviewed-on: https://gerrit.libreoffice.org/17438Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
Tested-by: Katarina Behrens <Katarina.Behrens@cib.de>
(cherry picked from commit ef126328)
Reviewed-on: https://gerrit.libreoffice.org/17448Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

vcl/unx/kde4/KDESalGraphics.cxx

@@ -109,10 +109,7 @@ bool KDESalGraphics::IsNativeControlSupported( ControlType type, ControlPart par
             return true;
 
         case CTRL_LISTBOX:
-            return (part == PART_ENTIRE_CONTROL
-                 || part == PART_SUB_EDIT
-                 || part == PART_WINDOW
-                 || part == PART_BUTTON_DOWN);
+            return (part == PART_ENTIRE_CONTROL || part == HAS_BACKGROUND_TEXTURE);
 
         case CTRL_SPINBOX:
             return (part == PART_ENTIRE_CONTROL || part == HAS_BACKGROUND_TEXTURE);
@@ -653,12 +650,6 @@ bool KDESalGraphics::getNativeControlRegion( ControlType type, ControlPart part,
                                              const OUString&,
                                              Rectangle &nativeBoundingRegion, Rectangle &nativeContentRegion )
 {
-    bool nativeSupport = IsNativeControlSupported( type, part );
-    if( ! nativeSupport ) {
-        assert( ! nativeSupport && "drawNativeControl called without native support!" );
-        return false;
-    }
-
     bool retVal = false;
 
     QRect boundingRect = region2QRect( controlRegion );
@@ -756,6 +747,14 @@ bool KDESalGraphics::getNativeControlRegion( ControlType type, ControlPart part,
                         int size = QApplication::style()->pixelMetric(QStyle::PM_ComboBoxFrameWidth) - 2;
                         contentRect.adjust(-size,-size,size,size);
                     }
+                    else {
+                        int hmargin = QApplication::style()->pixelMetric(
+                                QStyle::PM_FocusFrameHMargin, &styleOption);
+                        int vmargin = QApplication::style()->pixelMetric(
+                                QStyle::PM_FocusFrameVMargin, &styleOption);
+                        boundingRect.translate( -hmargin, -vmargin );
+                        boundingRect.adjust( -hmargin, -vmargin, 2 * hmargin, 2 * vmargin );
+                    }
                     retVal = true;
                     break;
                 }
@@ -779,7 +778,6 @@ bool KDESalGraphics::getNativeControlRegion( ControlType type, ControlPart part,
 
                     contentRect.translate( boundingRect.left() + hmargin, boundingRect.top() + vmargin );
                     contentRect.adjust( 0, 0, -2 * hmargin, -2 * vmargin );
-                    boundingRect = contentRect;
 
                     retVal = true;
                     break;