[Eric] eric4 inserts control characters on Ctrl+S when file was already saved

[Andreas Pakulat]

Hi,

not sure wether this is an eric4 or QScintilla bug, but as the shortcut
probably is assigned to eric4 I'm filing it here first.

eric4 inserts a <DC3> (gray background, not sure what the meaning is)
control character when pressing the Save-Shortcut in a document that has
already been saved. It inserts a new character each time the shortcut is
pressed.

Andreas

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