tdf#150806 ODT export: fix fallback svg:width/height for zero layout size

The reported problem was that once tracked changes is enabled and an
image is deleted, its aspect ratio changes on save.

What happens here is that the image's frame is marked as a redline
deletion, so when the ODT export writes the file, it'll have a zero
size. But this zero size is nothing we should take into account on save,
XMLTextParagraphExport::addTextFrameAttributes() expected to always have
a valid layout size if the LayoutSize property is available.

Fix the problem by adding one more condition where we ignore the layout
size, which was already there since commit
80550ade305b9e68c6281a258d162bc2c413713a (tdf#150990 ODT export: fix
zero layout size of scale/scale images, 2022-09-20).

Note that this way the written side will be the original one, so only
the aspect ratio will be correct, but that was accepted as a compromise
earlier.

Change-Id: I108dc2428ce0cb07a044bfef216575fdba19267b
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/146043
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

3 files changed, 196 insertions, 0 deletions

diff --git a/xmloff/qa/unit/data/scale-width-redline.fodt b/xmloff/qa/unit/data/scale-width-redline.fodt
new file mode 100644
index 000000000000..6b98c6e27a34
--- /dev/null
+++ b/xmloff/qa/unit/data/scale-width-redline.fodt
@@ -0,0 +1,170 @@
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+        </draw:image>
+       </draw:frame></text:p>
+      <text:p text:style-name="Standard">Figure <text:sequence text:ref-name="refFigure0" text:name="Figure" text:formula="ooow:Figure+1" style:num-format="1">1</text:sequence>: <text:span text:style-name="T5">caption</text:span></text:p>
+     </draw:text-box>
+    </draw:frame></text:p>
+   <text:p text:style-name="Standard">after image</text:p>
+  </office:text>
+ </office:body>
+</office:document>
diff --git a/xmloff/qa/unit/text.cxx b/xmloff/qa/unit/text.cxx
index 1710f47fb25c..f7155f546df3 100644
--- a/xmloff/qa/unit/text.cxx
+++ b/xmloff/qa/unit/text.cxx
@@ -886,6 +886,27 @@ CPPUNIT_TEST_FIXTURE(XmloffStyleTest, testDropdownContentControlAutostyleExport)
     xStorable->storeToURL(maTempFile.GetURL(), aStoreProps);
 }
 
+CPPUNIT_TEST_FIXTURE(XmloffStyleTest, testScaleWidthRedline)
+{
+    // Given a document with change tracking enabled, one image is part of a delete redline:
+    loadFromURL(u"scale-width-redline.fodt");
+    dispatchCommand(mxComponent, ".uno:TrackChanges", {});
+    dispatchCommand(mxComponent, ".uno:GoToEndOfLine", {});
+    dispatchCommand(mxComponent, ".uno:EndOfParaSel", {});
+    dispatchCommand(mxComponent, ".uno:Delete", {});
+
+    // When saving to ODT:
+    save("writer8");
+
+    // Then make sure that a non-zero size is written to the output:
+    xmlDocUniquePtr pXmlDoc = parseExport("content.xml");
+    // Without the accompanying fix in place, this test would have failed with:
+    // - Expected: 6.1728in
+    // - Actual  : 0in
+    // i.e. the deleted image had zero size, which is incorrect.
+    assertXPath(pXmlDoc, "//draw:frame[@draw:name='Image45']", "width", "6.1728in");
+}
+
 CPPUNIT_PLUGIN_IMPLEMENT();
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/xmloff/source/text/txtparae.cxx b/xmloff/source/text/txtparae.cxx
index f0f6360b4904..59e755f0e676 100644
--- a/xmloff/source/text/txtparae.cxx
+++ b/xmloff/source/text/txtparae.cxx
@@ -2873,6 +2873,11 @@ XMLShapeExportFlags XMLTextParagraphExport::addTextFrameAttributes(
         // invalid layout size we got.
         bUseLayoutSize = false;
     }
+    if (aLayoutSize.Width <= 0 || aLayoutSize.Height <= 0)
+    {
+        // This is broken, Writer frames have a minimal size, see MINFLY.
+        bUseLayoutSize = false;
+    }
 
     // svg:width
     sal_Int16 nWidthType = SizeType::FIX;