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Use temporary file when saving editor map
Write the map to a temporary file first. When the map was saved to the temporary file successfully, first delete the existing map file having the real filename, then rename the temporary file to the real filename. If deleting or renaming fails, show an error message popup and log an error message to the console. The implementation is consistent with the way temporary files are utilized by Microsoft Word, so this should work on Windows. See: https://support.microsoft.com/en-us/topic/description-of-how-word-creates-temporary-files-66b112fb-d2c0-8f40-a0be-70a367cc4c85 Different from ddnet#4482, this first deletes the old map file before renaming the temporary file. Although it appears that renaming a file would also override the target file, it could be that this does not work on all systems. Additionally, this adds descriptive error messages in the cases of failure. Closes ddnet#4476. Co-authored-by: Dennis Felsing <[email protected]>
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