Description: Using a formula in a Rich Text (.rtf) document can lead to a broken file. LibreOffice throws a File format error, when trying to open the document afterwards. The Reason seems to be, that under certain circumstances, a parenthesis mismatch is produced in the file, leaving an open parenthesis from the formula object in the rich text syntax (see reproduction steps below). Steps to Reproduce: 1. Insert a formula (via Insert > Object > Formula) 2. Save document as RTF 3. Remove the formula using backspace 4. Undo the removal 5. Save and close document 6. Opening document throws file format error, due to syntax error in the file. Actual Results: File format error found at 19,7 /build/libreoffice-still/src/libreoffice-7.0.5.2/writerfilter/source/rtftok/rtfdocumentimpl.cxx:817(row,col). Expected Results: Keep the syntax intact. Reproducible: Always User Profile Reset: No OpenGL enabled: Yes Additional Info: Version: 7.0.5.2 Build ID: 00(Build:2) CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: kf5 Locale: de-DE (en_GB.UTF-8); UI: en-GB 7.0.5-1 Calc: threaded
Confirmed on windows 10 x64 with Version: 7.0.5.2 (x64) Build ID: 64390860c6cd0aca4beafafcfd84613dd9dfb63a CPU threads: 12; OS: Windows 10.0 Build 19042; UI render: Skia/Raster; VCL: win Wordpad however can open the file without a problem.
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