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bug#5977: 24.0.50; Lao HELLO is incorrectly displayed

From: Peter Dyballa
Subject: bug#5977: 24.0.50; Lao HELLO is incorrectly displayed
Date: Tue, 20 Apr 2010 12:28:11 +0200

Am 20.04.2010 um 11:06 schrieb Eli Zaretskii:

The Lao greetings are incorrectly rendered:

Does the problem go away if you type

   M-: (setq bidi-display-reordering nil) RET

YES! Many displayed strings change their shape afterwards.


When I go forward or backward with the cursor keys in the greetings
(also in the header) the direction of cursor movement is reversed at
two or three spots.

I don't see cursor movement reversal on MS-Windows.  Can you tell what
characters are those where it happens, e.g., by counting the number of
C-f keystrokes from the beginning of the line?

When I start at the default minor-mode at the left-most character, the strings first change their look. First <right> position point on the third character. When I now invoke C-u C-x = on this character point goes left to the second character. Next <right> changes again the shape of the strings. Next <right> warps point to fifth character, next <right> back to fourth, next <right> to seventh, then comes <SPACE>, then warp to /, <SPACE>, first character of second string. Next <right> positions point on second character and one more <right> leaps to possibly fourth one, then fifth (neighbour), then jump to possibly seventh, eighth, last ninth, before it falls down on next line right of the small depressed Ω like character (see my screenshot).

With bidi-display-reordering set to nil no change in direction of movement happens. (Cursor also stops at final C-j of line. Next <right> does the line-feed and carriage-return.)



Time flies like an error – but fruit flies like a banana!
                                - (almost) Groucho Marx

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