User Agent: Mozilla/5.0 (Windows NT 6.0; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0 Build ID: 20150812163655 Steps to reproduce: Thunderbird version 38.2.0 1. Select an e-mail from my inbox. 2. Click on Forward button *** Note: My e-mail option says to convert to Plain Text (not HTML) *** *** Note: My e-mail option says to forward messages "inline". *** Note: My e-mail option is to open messages in an existing window. 3. The text of the selected msg will be shown below 3 blank lines and then -------- Forwarded Message -------- 4. (Optional) Place cursor on the 3rd blank line and type AAA. 5. Place cursor on the first blank line and press the Delete key. Actual results: The first blank line is deleted (as expected) and the following lines are moved up one position (as expected), but then the cursor is moved down to the new line 2 position (unexpected) instead of remaining on line 1. Expected results: The cursor should have remained on line 1, position 1. If I intended to delete more than 1 line, it would have removed the wrong line or it would have deleted characters from the wrong line. (AAA becomes AA). This has been happening for years -- long before version 38.2.0.
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