514286 - When restoring deleted selection with Undo, "polarity" of selection isn't preserved

Status: NEW

(Core :: DOM: Selection, defect, P5)

Description

[Daniel Holbert [:dholbert]]

STEPS TO REPRODUCE:
 1. Type "abcd" into a text box
 2. Position your cursor to the right of "c".
 3. Hold shift, and press the leftarrow key twice
   --> Now "bc" should be highlighted
 4. Press your "delete" or "backspace" key to kill the highlighted text.
 5. Use "Undo" (Ctrl-Z) to resurrect the text 
   --> Now we look just like after Step 3 -- "bc" is highlighted
 6. Hold shift, and press leftarrow once more.

EXPECTED RESULTS:
 "abc" should be highlighted. (The selection should extend one unit leftwards, continuing from where we left off.)

ACTUAL RESULTS:
 "b" is the only thing highlighted. (The selection is shrunk from the right edge.)


Here's another way of phrasing this bug: When we restore a deleted selection via "Undo", we don't preserve the "polarity" of the selection. (By polarity, I mean "which side of the selection will be modified by pressing shift+arrowkeys")  Instead, we simply force the "selecting-forward" polarity.

I can reproduce this in mozilla-central nightlies, as well as in Firefox 3.0.13:
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.3a1pre) Gecko/20090901 Minefield/3.7a1pre
Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.0.13) Gecko/2009080315 Ubuntu/9.04 (jaunty) Firefox/3.0.13

Comment 1

[Jens Stutte [:jstutte]]

Bulk-downgrade of unassigned, >=3 years untouched DOM/Storage bug's priority.

If you have reason to believe this is wrong, please write a comment and ni :jstutte.