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<p><b>Steps to reproduce:</b></p>
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<li>Debug it:<br>
[^ #foo] <span style="font-size: 12pt;">ensure: [#bar]</span><br>
</li><li><span style="font-size: 12pt;">Press Through two times to get into [#bar].</span></li></ol>
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<div><b>Expected behavior:</b></div>
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<div class="_rp_T4" id="Item.MessagePartBody">The stack list should look like this:
<div class="_rp_U4 ms-font-weight-regular ms-font-color-neutralDark rpHighlightAllClass rpHighlightBodyClass" id="Item.MessageUniqueBody" style="font-family:wf_segoe-ui_normal,"Segoe UI","Segoe WP",Tahoma,Arial,sans-serif,serif,EmojiFont">
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<div class="_rp_T4" id="Item.MessagePartBody"><img size="25591" contenttype="image/png" id="img759699" style="max-width: 99.9%; user-select: none;" contextid="img308429" tabindex="0" src="cid:365dffbc-651c-472c-91de-2779499a9dfe"><br>
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<div class="_rp_T4" id="Item.MessagePartBody"><br>
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<div class="_rp_T4" id="Item.MessagePartBody"><b>Actual behavior:</b></div>
<div class="_rp_T4" id="Item.MessagePartBody">Actually, it looks like this:</div>
<div class="_rp_T4" id="Item.MessagePartBody"><img size="26699" contenttype="image/png" id="img922810" style="max-width: 99.9%; user-select: none;" contextid="img446260" tabindex="0" src="cid:e754f61d-f4bd-4af9-b90b-22c2d2deffa0"><br>
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<div class="_rp_T4" id="Item.MessagePartBody">Selecting the second top context reveals that the list contents are wrong:</div>
<div class="_rp_T4" id="Item.MessagePartBody"><img size="25614" contenttype="image/png" id="img461663" style="max-width: 99.9%; user-select: none;" contextid="img463740" tabindex="0" src="cid:def1c577-b17d-44e6-83b7-110622436635"><br>
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<div class="_rp_T4" id="Item.MessagePartBody"><br>
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<div class="_rp_T4" id="Item.MessagePartBody"><b>Considerations:</b></div>
<div class="_rp_T4" id="Item.MessagePartBody">The failure appears to happen in Debugger >> #newStack:, where the assumption is made that if the new stack is higher by exactly one context compared to the old one (diff = 1), then only the top context could have
changed. The example shows that this assumption is wrong.</div>
<div class="_rp_T4" id="Item.MessagePartBody">A fix for this particular issue is on the way into the inbox. However, I'm not sure whether it will be an adequate solution but not only an ugly workaround.</div>
<div class="_rp_T4" id="Item.MessagePartBody"><br>
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<div class="_rp_T4" id="Item.MessagePartBody">Is this optimization relevant at all today? I found an older screenshot (in Squeak by Example) that looks as if some previous versions of Squeak may have decompiled all blocks for the #printString representation:</div>
<div class="_rp_T4" id="Item.MessagePartBody"><img size="144591" contenttype="image/png" id="img169044" style="" contextid="img748547" tabindex="0" height="180" width="336" sizeoption="small" src="cid:9b23ddcb-fd0b-4bb8-a07e-574897e57ecb"><br>
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<div class="_rp_T4" id="Item.MessagePartBody"><br>
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<div class="_rp_T4" id="Item.MessagePartBody">Looking forward to your feedback! :-)</div>
<div class="_rp_T4" id="Item.MessagePartBody"><br>
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<div class="_rp_T4" id="Item.MessagePartBody">Best,</div>
<div class="_rp_T4" id="Item.MessagePartBody">Christoph</div>
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