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This is _not_ the first time I encounter this nasty bug. It was probably already reported but I couldn't find :-( Sometimes, the keys pressed in one editor file modifies another opened file. I join ide.log, there are some exceptions, perhaps they are related? Thank you for your support.
Created attachment 1864 [details] ide.log
Read the comments in issue 5697. It should be fixed in Development builds (means it is not in 3.2). *** This issue has been marked as a duplicate of 5697 ***
Resolved for 3.3.x or earlier, no new info since then -> closing.