docs: add kb on spire office truncated text issue

knowledge-base/text-truncation-spire-office-reporting.md

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+---
+title: Text Truncation in Rendered Reports When Using Spire.Office with Telerik Reporting
+description: "Learn how to fix text truncation issues in Telerik Reporting when using the Spire.Office libraries in the same application."
+type: troubleshooting
+page_title: Fix Text Truncation When Using Spire.Office with Telerik Reporting
+slug: text-truncation-spire-office-reporting
+tags: reporting, spire, office, text, truncation, stringformat, gdi
+res_type: kb
+---
+
+## Environment
+
+<table>
+  <tbody>
+    <tr>
+      <td>Product</td>
+      <td>Progress® Telerik® Reporting</td>
+      <td>Spire.Office</td>
+    </tr>
+    <tr>
+      <td>Version</td>
+      <td>19.2.25.1001</td>
+      <td>8.12.2 or earlier</td>
+    </tr>
+  </tbody>
+</table>
+
+## Description
+
+When using the Telerik Reporting in the same application that processes MS Office documents and PDF files with Spire.Office libraries, the text in the rendered reports gets truncated unexpectedly.
+
+This issue occurs even when the Spire.Office operations are performed on completely unrelated documents before rendering the Telerik report.
+
+## Cause
+
+The issue is caused by Spire.Office modifying the global state of `System.Drawing.StringFormat.GenericTypographic`. After Spire.Office processes documents, the `GenericTypographic` method no longer returns a `StringFormat` object with the expected format flags.
+
+**Expected StringFormat flags:**
+- `StringFormatFlagsLineLimit`
+- `StringFormatFlagsNoClip`
+- `StringFormatFlagsNoFitBlackBox`
+
+**Actual StringFormat flags after Spire.Office usage:**
+- `StringFormatFlagsLineLimit`
+- `StringFormatFlagsNoClip`
+- `StringFormatFlagsNoFitBlackBox`
+- `MeasureTrailingSpaces` (additional flag)
+
+The extra `MeasureTrailingSpaces` flag causes incorrect text measurement in Telerik Reporting's GDI wrapper, leading to text truncation in some scenarios.
+
+## Solution
+
+To resolve this issue, manually remove the `MeasureTrailingSpaces` flag from the `GenericTypographic` StringFormat after using Spire.Office operations and before rendering Telerik reports:
+
+````C#
+using Telerik.Reporting;
+using Telerik.Reporting.Processing;
+
+// Spire.Office operations
+Spire.Doc.Document document = new Spire.Doc.Document();
+var wordDocPath = "./wordtest.docx";
+var pdfFilePath = System.IO.Path.Combine("../../../", "wordtest.pdf");
+
+document.LoadFromFile(wordDocPath);
+Spire.Doc.ToPdfParameterList toPdf = new Spire.Doc.ToPdfParameterList();
+document.SaveToFile(pdfFilePath, toPdf);
+document.Close();
+
+// Fix the StringFormat issue caused by Spire.Office
+System.Drawing.StringFormat.GenericTypographic.FormatFlags &= ~System.Drawing.StringFormatFlags.MeasureTrailingSpaces;
+
+// Telerik Reporting operations
+// ...
+````
+
+## Additional Information
+
+This issue affects only older versions of Spire.Office that use the GDI+ engine for text rendering. Starting from version `9.2.0`, it does not rely on GDI+.