acme: avoid division by zero when resizing col (#189)
To reproduce, create a column with at least two windows and resize acme to have almost zero height. (imported from plan9port commit 76b9347a5fa3a0970527c6ee1b97ef1c714f636b)
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@ -197,8 +197,11 @@ colresize(Column *c, Rectangle r)
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w->maxlines = 0;
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if(i == c->nw-1)
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r1.max.y = r.max.y;
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else
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r1.max.y = r1.min.y+(Dy(w->r)+Border)*Dy(r)/Dy(c->r);
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else {
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r1.max.y = r1.min.y;
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if(Dy(c->r) != 0)
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r1.max.y += (Dy(w->r)+Border)*Dy(r)/Dy(c->r);
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}
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r2 = r1;
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r2.max.y = r2.min.y+Border;
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draw(screen, r2, display->black, nil, ZP);
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