Display the D3D12 IA indexStripCutValue in UI control "Restart Idx"

Previously "Restart Idx" was hardcoded to 0xFFFFFFFF
Show "Disabled" if the indexStripCutValue is D3D12_INDEX_BUFFER_STRIP_CUT_VALUE_DISABLED (0)

Similar GL pipeline stat viewer UI behaviour

Author: Zorro666

qrenderdoc/Windows/PipelineState/D3D12PipelineStateViewer.cpp

@@ -1051,6 +1051,7 @@ void D3D12PipelineStateViewer::clearState()
   ui->iaLayouts->clear();
   ui->iaBuffers->clear();
   ui->topology->setText(QString());
+  ui->primRestart->setVisible(false);
   ui->topologyDiagram->setPixmap(QPixmap());
 
   clearShaderState(ui->asShader, ui->asRootSig, ui->asResources, ui->asSamplers, ui->asCBuffers,
@@ -1350,6 +1351,20 @@ void D3D12PipelineStateViewer::setState()
 
     bool ibufferUsed = action && (action->flags & ActionFlags::Indexed);
 
+    if(ibufferUsed)
+    {
+      ui->primRestart->setVisible(true);
+      if(state.inputAssembly.indexStripCutValue != 0)    // D3D12_INDEX_BUFFER_STRIP_CUT_VALUE_DISABLED
+        ui->primRestart->setText(
+            tr("Restart Idx: 0x%1").arg(Formatter::Format(state.inputAssembly.indexStripCutValue, true)));
+      else
+        ui->primRestart->setText(tr("Restart Idx: Disabled"));
+    }
+    else
+    {
+      ui->primRestart->setVisible(false);
+    }
+
     m_VBNodes.clear();
     m_EmptyNodes.clear();