[squeak-dev] [5.2a] styled text in a class comment spawns endless subscript out-of-bounds

karl ramberg karlramberg at gmail.com
Tue Jul 3 18:34:12 UTC 2018


Weird error.
See Debugger in attachment,
How come selectionInterval and interval is different ?

Best,
Karl

On Tue, Jul 3, 2018 at 1:10 AM Tim Johnson <digit at sonic.net> wrote:

> Hi,
>
> A class with styled text in its class comment, when a user mouses around
> in the text, can eventually trigger endless subscript out-of-bounds
> windows to pop up, requiring Cmd-. and 'close all windows like this'.
> (The styled text may have entered the class comment from a user pasting
> Shout-styled text from a method into the class comment.)
>
> I have run into this one before but never pinpointed a cause.  This has
> probably been broken for some time.  I have updated my image to #18134
> and it still has the problem.  It may be related to a class with styled
> text being exported from one image and imported into another.
>
> Maybe this would be a good one for a Mantis report.
>
> How to reproduce:
>
> 1. File-in the .cs as attached*.
> 2. In a system browser, click on the class, then click on the [?] button
> to view class comment.
> 3. Notice the styled text in the comment.
> 4. Click around the comment pane a bit.
> 5. Eventually, see "Error: subscript is out of bounds: 71" appear over
> and over until you interrupt.
>
> * this .cs is a slimmed-down and hand-edited version of a real file-out
> of a real class which was exhibiting this problem.  In preparing the .cs
> for this mailing, I've shortened the class name by three characters.  If
> you notice the "style[(1 35 18 20 3),f1,,b," doesn't match, this may be
> why.
>
> .cs file and stack follow.
>
> Thanks,
> Tim
>
> ByteString(Object)>>error:
> ByteString(Object)>>errorSubscriptBounds:
> ByteString(Object)>>at:
> ByteString>>at:
>
> CharacterBlockScanner(CharacterScanner)>>basicScanByteCharactersFrom:to:in:rightX:
>
> CharacterBlockScanner(CharacterScanner)>>primScanCharactersFrom:to:in:rightX:stopConditions:kern:
>
> CharacterBlockScanner(CharacterScanner)>>scanByteCharactersFrom:to:in:rightX:
> StrikeFont(AbstractFont)>>scanByteCharactersFrom:to:in:with:rightX:
> ByteString>>scanCharactersFrom:to:with:rightX:font:
> CharacterBlockScanner(CharacterScanner)>>scanCharactersFrom:to:in:rightX:
> CharacterBlockScanner>>characterBlockAtPoint:index:in:
> NewParagraph>>characterBlockForIndex:
> SmalltalkEditor(TextEditor)>>markIndex:pointIndex:
> SmalltalkEditor(Editor)>>selectInvisiblyFrom:to:
> SmalltalkEditor(TextEditor)>>selectFrom:to:
> SmalltalkEditor(Editor)>>selectInterval:
> PluggableTextMorphPlus(PluggableTextMorph)>>mouseEnter:
> PluggableTextMorphPlus(Morph)>>handleMouseEnter:
> MouseMoveEvent(MouseEvent)>>sentTo:
> MouseMoveEvent>>sentTo:
> PluggableTextMorphPlus(Morph)>>handleEvent:
> [] in MouseOverHandler>>processMouseOver:
> Array(SequenceableCollection)>>reverseDo:
> MouseOverHandler>>processMouseOver:
> HandMorph>>handleEvent:
> HandMorph>>processEvents
> [] in WorldState>>doOneCycleNowFor:
> Array(SequenceableCollection)>>do:
> WorldState>>handsDo:
> WorldState>>doOneCycleNowFor:
> WorldState>>doOneCycleFor:
> PasteUpMorph>>doOneCycle
> [] in MorphicProject>>spawnNewProcess
> [] in BlockClosure>>newProcess
>
>
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