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acme: avoid division by zero when resizing col (#189)

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To reproduce, create a column with at least two windows and resize
acme to have almost zero height.

(imported from plan9port commit 76b9347a5fa3a0970527c6ee1b97ef1c714f636b)
This commit is contained in:
Ori Bernstein 2019-12-04 12:37:07 -08:00
parent a181f3dd3e
commit 2b5db0d9d4
1 changed files with 5 additions and 2 deletions
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7
sys/src/cmd/acme/cols.c
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@ -197,8 +197,11 @@ colresize(Column *c, Rectangle r)
w->maxlines = 0;
if(i == c->nw-1)
r1.max.y = r.max.y;
else
r1.max.y = r1.min.y+(Dy(w->r)+Border)*Dy(r)/Dy(c->r);
else {
r1.max.y = r1.min.y;
if(Dy(c->r) != 0)
r1.max.y += (Dy(w->r)+Border)*Dy(r)/Dy(c->r);
}
r2 = r1;
r2.max.y = r2.min.y+Border;
draw(screen, r2, display->black, nil, ZP);