Nice demo! I think having a unified tool for this is fantastic. I can see how it will be useful in building other interfaces down the line (such as in presenting parallel columns with transclusions that make it hard to column-balance elegantly in advance — just allowing the viewer to drag the column border will save me trying to set up some convoluted and fragile optimizing-solution.)
I’ve installed it at quick-demo — and have noticed a couple quirks (and not enough time to troubleshoot further today).:
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Somehow my sidebar suddenly widens a bit when I open the control panel in the story river… Or rather, opening the control panel makes the story river get thinner. This happens unless the control panel is on the “saving” tab…, quite perplexing. And also: This happens only in Chrome, not in Safari… Widths jumps back to normal when I close the control panel.
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Opening the shadow tiddler for the sidebar template causes double-rendering, off diagonally by a few pixels (and I see it doesn’t do that on your demo site). Somehow, it’s not playing nice with other modifications I’ve made to my sidebar (mostly about spacing; other css seems to be identical).
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Understandably, your edit-preview resizer isn’t designed to work with the CodeMirror plugin, so it has no effect there — which is actually one of the main draws for me. (Meanwhile, for reasons I don’t fully understand, trying to disable CodeMirror is leaving me with no edit interface; the plugin just isn’t disabling itself nicely enough — so there’s a different thing for me to troubleshoot.)
For now, I’ve your resizer it up at quick-demo, in case you want to have a look and see how/why it behaves a bit differently in that environment.