[racket] Strange editor behaviour

Yeah, there are a number of variables that seem to be reset on
edit-sequences. Another one that may or may not be related to this same
variable is when esc;y works.

Robby


On Sat, Sep 14, 2013 at 4:03 PM, Neil Toronto <neil.toronto at gmail.com>wrote:

> I appreciate your work on this, and also how tiny the test case is. :)
>
> If it helps - and it may just confirm your theories - I've noticed that
> when the bad behavior happens, CTRL-Z undoes single keystrokes.
>
>
> On 09/14/2013 02:00 PM, Robby Findler wrote:
>
>> A little more progress: it turns out that simply turning on and turning
>> off an edit-sequence in a text% object clears some internal state in a
>> text% object (the extend-streak? field) and, when the search bars are
>> open, more edit sequences are flying around. That seems wrong to me
>> (that starting and ending an edit-sequence would clear this state), but
>> I'm not sure if the answer can be as simple as avoiding this
>> state-clearing action or not. Anyways, here's some simple code that
>> demonstrates how far I've gotten.
>>
>>
>> #lang racket/base
>> (require rackunit racket/class racket/gui/base)
>>
>> (check-equal? (let ()
>>                  (define t (new text%))
>>                  (send t insert "abcdef")
>>                  (send t set-position 3 3)
>>                  (send t move-position 'right #t)
>>                  (send t move-position 'left #t)
>>                  (list (send t get-start-position)
>>                        (send t get-end-position)))
>>                (list 3 3))
>>
>>
>> (check-equal? (let ()
>>                  (define t (new text%))
>>                  (send t insert "abcdef")
>>                  (send t set-position 3 3)
>>                  (send t move-position 'right #t)
>>                  (send t begin-edit-sequence)
>>                  (send t end-edit-sequence)
>>                  (send t move-position 'left #t)
>>                  (list (send t get-start-position)
>>                        (send t get-end-position)))
>>                (list 3 3))
>>
>> Robby
>>
>>
>>
>> On Sat, Sep 14, 2013 at 12:43 PM, Neil Toronto <neil.toronto at gmail.com
>> <mailto:neil.toronto at gmail.com**>> wrote:
>>
>>     Yes! You figured it out! This has been bugging me for months.
>>
>>     Here's more info, in case it helps. In addition to SHIFT+Left,
>>     SHIFT+Right, SHIFT+Up and SHIFT+Down always expanding the selection
>>     when Replace is shown, so does SHIFT-End, and all the SHIFT+ALT
>>     arrow combos and SHIFT+CTRL combos. SHIFT-Home only works when the
>>     selection doesn't span multiple lines.
>>
>>     If the Search box is empty, selection works as expected. (That is,
>>     getting in this always-expanding-selection or
>>     caret-position-forgetting state requires the Replace box to be shown
>>     and the Search box to have text in it.) If the Search box has text
>>     in it, it doesn't matter whether it's found. I'm guessing there's
>>     some caret-wrangling code for the search bar that causes the editor
>>     to forget the caret position while selecting.
>>
>>     Selection in the REPL also seems to be affected by Search and
>>     Replace in exactly the same way. (I haven't tested it thoroughly.)
>>
>>     We should have Eli test this because he's had the same problem.
>>     IIRC, he uses Linux, and so do I: I've seen this on Ubuntu 12.04 and
>>     13.04.
>>
>>     Neil ⊥
>>
>>
>>     On 09/14/2013 08:20 AM, bhrgunatha wrote:
>>
>>         After lots of head scratching and experimenting I have a
>>         consistent cause.
>>
>>         It seems like the Search and Replace bar causes some problem.
>>         It is only happening when the Replace text box is visible.
>>
>>         This weird behaviour disappears if the I click the Hide Replace
>>         button
>>         or choose Hide Replace from the Edit menu.
>>
>>         I've also noticed that S:C:R stops working after the Replace
>>         text box
>>         and buttons have disappeared. That is I can't Hide, then Re show
>> the
>>         Replace text box.
>>
>>         I hope that helps you fix the problem, but I'm pretty happy now
>>         I know
>>         how to get the correct operation back again.
>>
>>         Thanks,
>>         Bhrgunatha
>>
>>
>>         On 14/09/13 20:04, Robby Findler wrote:
>>
>>             This sounds like a bug in the implementation of the
>>             shift-left and
>>             shift-right keybindings.
>>
>>             If you can give some kind of a step by step procedure to get
>>             into the
>>             bad state, then I think we can probably fix it.
>>
>>             Robby
>>
>>
>>
>>             On Sat, Sep 14, 2013 at 6:16 AM, bhrgunatha
>>             <bhrgunatha at hotmail.com <mailto:bhrgunatha at hotmail.com**>
>>             <mailto:bhrgunatha at hotmail.com
>>
>>             <mailto:bhrgunatha at hotmail.com**>__>> wrote:
>>
>>                  I'm having a problem editing programs using DrRacket.
>>             This happened
>>                  once before but went away after re-installing. [1].
>>
>>                  I'm having the same issue again. Basically the
>>             behaviour of text
>>                  selection is changes while I open and edit different
>>             files running a
>>                  single instance of DrRacket.
>>
>>                  If I select some text and then press SHIFT+Left instead
>>             of altering
>>                  the selection based on the current cursor position, the
>>             selection is
>>                  extended left from the beginning of the text currently
>>             selected.
>>
>>                  Similarly for SHIFT+Right - it extends the text
>>             selection one
>>                  character to the right from the end of the selection
>>             rather than the
>>                  current cursor position. Same for SHIFT+Down, SHIFT+Up.
>>
>>                  Is there some key binding or setting in DrRacket that
>>             controls the
>>                  way text selection is handled that I am accidentally
>>             hitting?
>>
>>                  It doesn't happen in any other editor - it's specific
>>             to DrRacket.
>>
>>                  If I quit DrRacket and re-open it normal operation
>>             continues for a
>>                  while again. I don't know if it's a bug or some setting
>>             in DrRacket
>>                  that I am unaware of.
>>
>>                  My current specs are:
>>                  Arch Linux 64 bit:
>>                  Linux 3.10.10-1-ARCH #1 SMP PREEMPT x86_64 GNU/Linux
>>
>>                  DrRacket 5.3.6.
>>                  (This is a version I compiled myself - but it's the
>>             same using the
>>                  Arch binary package - racket 5.3.6-1)
>>
>>                  Can someone offer any advice?
>>
>>                  Bhrgunatha
>>
>>                  [1]
>>
>>             http://article.gmane.org/____**gmane.comp.lang.racket.user/__
>> **__17034/match=bhrgunatha<http://article.gmane.org/____gmane.comp.lang.racket.user/____17034/match=bhrgunatha>
>>             <http://article.gmane.org/__**gmane.comp.lang.racket.user/__*
>> *17034/match=bhrgunatha<http://article.gmane.org/__gmane.comp.lang.racket.user/__17034/match=bhrgunatha>
>> >
>>
>>
>>
>>             <http://article.gmane.org/__**gmane.comp.lang.racket.user/__*
>> *17034/match=bhrgunatha<http://article.gmane.org/__gmane.comp.lang.racket.user/__17034/match=bhrgunatha>
>>             <http://article.gmane.org/**gmane.comp.lang.racket.user/**
>> 17034/match=bhrgunatha<http://article.gmane.org/gmane.comp.lang.racket.user/17034/match=bhrgunatha>
>> >>
>>
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