widget theme: change the tab item height to (min) 32 px

Change-Id: I1919300071a06242fe832880b46c944989daa4b6
Reviewed-on: https://gerrit.libreoffice.org/69057
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

vcl/source/gdi/FileDefinitionWidgetDraw.cxx

@@ -776,10 +776,12 @@ bool FileDefinitionWidgetDraw::getNativeControlRegion(
             if (!pPart)
                 return false;
 
-            rNativeBoundingRegion = tools::Rectangle(
-                rBoundingControlRegion.TopLeft(),
-                Size(rBoundingControlRegion.GetWidth() + pPart->mnMarginWidth,
-                     rBoundingControlRegion.GetHeight() + pPart->mnMarginHeight));
+            long nWidth = std::max(rBoundingControlRegion.GetWidth() + pPart->mnMarginWidth,
+                                   long(pPart->mnWidth));
+            long nHeight = std::max(rBoundingControlRegion.GetHeight() + pPart->mnMarginHeight,
+                                    long(pPart->mnHeight));
+
+            rNativeBoundingRegion = tools::Rectangle(aLocation, Size(nWidth, nHeight));
             rNativeContentRegion = rNativeBoundingRegion;
             return true;
         }

vcl/uiconfig/theme_definitions/definition.xml

@@ -320,7 +320,7 @@
     </progress>
 
     <tabitem>
-        <part value="Entire" margin-width="20" margin-height="6">
+        <part value="Entire" margin-width="8" height="32">
             <state selected="false" extra="first">
                 <external source="tabitem-first.svgx" />
             </state>