[FEThumbnails]Add cleanup code to avoid locking files (#32108)

src/modules/previewpane/GcodeThumbnailProviderCpp/GcodeThumbnailProvider.cpp

@@ -183,6 +183,12 @@ IFACEMETHODIMP GcodeThumbnailProvider::GetThumbnail(UINT cx, HBITMAP* phbmp, WTS
         }
     }
 
+    // ensure releasing the stream (not all if branches contain it)
+    if (m_pStream)
+    {
+        m_pStream->Release();
+        m_pStream = NULL;
+    }
 
     return S_OK;
 }

src/modules/previewpane/PdfThumbnailProviderCpp/PdfThumbnailProvider.cpp

@@ -182,6 +182,13 @@ IFACEMETHODIMP PdfThumbnailProvider::GetThumbnail(UINT cx, HBITMAP* phbmp, WTS_A
         }
     }
 
+    // ensure releasing the stream (not all if branches contain it)
+    if (m_pStream)
+    {
+        m_pStream->Release();
+        m_pStream = NULL;
+    }
+
     return S_OK;
 }
 

src/modules/previewpane/QoiThumbnailProviderCpp/QoiThumbnailProvider.cpp

@@ -183,6 +183,12 @@ IFACEMETHODIMP QoiThumbnailProvider::GetThumbnail(UINT cx, HBITMAP* phbmp, WTS_A
         }
     }
 
+    // ensure releasing the stream (not all if branches contain it)
+    if (m_pStream)
+    {
+        m_pStream->Release();
+        m_pStream = NULL;
+    }
 
     return S_OK;
 }

src/modules/previewpane/StlThumbnailProviderCpp/StlThumbnailProvider.cpp

@@ -181,6 +181,13 @@ IFACEMETHODIMP StlThumbnailProvider::GetThumbnail(UINT cx, HBITMAP* phbmp, WTS_A
         }
     }
 
+    // ensure releasing the stream (not all if branches contain it)
+    if (m_pStream)
+    {
+        m_pStream->Release();
+        m_pStream = NULL;
+    }
+
     return S_OK;
 }
 

src/modules/previewpane/SvgThumbnailProviderCpp/SvgThumbnailProvider.cpp

@@ -182,6 +182,13 @@ IFACEMETHODIMP SvgThumbnailProvider::GetThumbnail(UINT cx, HBITMAP* phbmp, WTS_A
         }
     }
 
+    // ensure releasing the stream (not all if branches contain it)
+    if (m_pStream)
+    {
+        m_pStream->Release();
+        m_pStream = NULL;
+    }
+
     return S_OK;
 }