Catch xdvipdfmx driver error (that breaks XeTeX compilation).

This prevents an assertion due to an unrecognized error.

Fixes: #10076.

src/LaTeX.cpp

@@ -887,8 +887,16 @@ int LaTeX::scanLogFile(TeXErrors & terr)
 			} else if (contains(token, "No pages of output")) {
 				// A dvi file was not created
 				retval |= NO_OUTPUT;
+			} else if (contains(token, "Error 256 (driver return code)")) {
+				// This is a xdvipdfmx driver error reported by XeTeX.
+				// We have to check whether an output PDF file was created.
+				FileName pdffile = file;
+				pdffile.changeExtension("pdf");
+				if (!pdffile.exists())
+					// No output PDF file was created (see #10076)
+					retval |= NO_OUTPUT;
 			} else if (contains(token, "That makes 100 errors")) {
-				// More than 100 errors were reprted
+				// More than 100 errors were reported
 				retval |= TOO_MANY_ERRORS;
 			} else if (prefixIs(token, "!pdfTeX error:")) {
 				// otherwise we dont catch e.g.:

status.22x

@@ -49,6 +49,8 @@ What's new
 
 - Catch "! Incomplete \if[x]" LaTeX error (bug 10666).
 
+- Catch xdvipdfmx driver error that breaks XeTeX compilation (bug 10076).
+
 - Fix caption handling in listings insets when it is split into multiple
   lines in the LaTeX output (bug 10705).