helpThe GNU Readline library - Support: sr #109478, Readline does not maintain mark...


sr #109478: Readline does not maintain mark correctly when inserting text

Submitted by:  None
Submitted on:  Wed 21 Mar 2018 08:04:12 PM UTC  
Category:  None Priority:  5 - Normal
Severity:  3 - Normal Status:  Wont Do
Privacy:  Public Assigned to:  None
Originator Email:  -email is unavailable- Open/Closed:  Open
Operating System:  GNU/Linux

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Wed 26 Dec 2018 07:47:44 PM UTC, comment #1: 

This is how the mark works in readline. It is a saved value of point, which is an offset in characters from the beginning of the line. It is not a saved offset from point, does not move when point does, and does not track the character it's on when set.

This is how it works in vi mode, too.

Chet Ramey <chet>
Project Administrator
Wed 21 Mar 2018 08:04:12 PM UTC, original submission:  

The behavior, described in detail below, is observed on multiple systems:

GNU bash, version 4.3.30(1)-release (x86_64-pc-linux-gnu) with

GNU bash, version 4.1.2(1)-release (x86_64-redhat-linux-gnu) with /lib64/

GNU bash, version 3.2.25(1)-release (x86_64-redhat-linux-gnu) with

1. Type text into a bash interactive shell, e.g., "0123456789"
2. Cursor left, e.g., move left two spaces so point is between 7 and 8.
3. Exchange point and mark with "C-x C-x".  Mark is now between 7 and 8 and point is at beginning of line (initial mark)
4. Type new characters, e.g., "abc"
5. Exchange point and mark.

=> The cursor (point) is improperly placed in the same absolute position where the mark was, not the logical location in the text.  In the example of (4), point is placed length("abc") to the left of where is should be.

Note: In the CHANGES from readline-5.2 to readline-6.0, a similar bug was fixed specific to vi mode.



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    Follows 1 latest change.

    Date Changed by Updated Field Previous Value => Replaced by
    2018-12-26 chet StatusNone => Wont Do

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