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diff --git a/prev/wintable/update.h b/prev/wintable/update.h
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+// 8 january 2015
+
+// Whenever a number of things in the Table changes, the update() function needs to be called to update any metrics and scrolling positions.
+// The control font changing is the big one, as that comes with a flag that decides whether or not to redraw everything. We'll need to respect that here.
+
+// For my personal convenience, each invocation of update() and updateAll() will be suffixed with a DONE comment once I have reasoned that the chosen function is correct and that no additional redrawing is necessary.
+
+// TODO actually use redraw here
+static void update(struct table *t, BOOL redraw)
+{
+	RECT client;
+	intptr_t i;
+	intptr_t height;
+
+	// before we do anything we need the client rect
+	if (GetClientRect(t->hwnd, &client) == 0)
+		panic("error getting Table client rect in update()");
+
+	// the first step is to figure out how wide the whole table is
+	// TODO count dividers?
+	t->width = 0;
+	for (i = 0; i < t->nColumns; i++)
+		t->width += columnWidth(t, i);
+
+	// now we need to figure out how much of the width of the table can be seen at once
+	t->hpagesize = client.right - client.left;
+	// this part is critical: if we resize the columns to less than the client area width, then the following hscrollby() will make t->hscrollpos negative, which does very bad things
+	// we do this regardless of which of the two has changed, just to be safe
+	if (t->hpagesize > t->width)
+		t->hpagesize = t->width;
+
+	// now we do a dummy horizontal scroll to apply the new width and horizontal page size
+	// this will also reposition and resize the header (the latter in case the font changed), which will be important for the next step
+	hscrollby(t, 0);
+
+	// now that we have the new height of the header, we can fix up vertical scrolling
+	// so let's take the header height away from the client area
+	client.top += t->headerHeight;
+	// and update our page size appropriately
+	height = client.bottom - client.top;
+	t->vpagesize = height / rowht(t);
+	// and do a dummy vertical scroll to apply that
+	vscrollby(t, 0);
+}
+
+// this is the same as update(), but also redraws /everything/
+// as such, redraw is TRUE
+static void updateAll(struct table *t)
+{
+	update(t, TRUE);
+	if (InvalidateRect(t->hwnd, NULL, TRUE) == 0)
+		panic("error queueing all of Table for redraw in updateAll()");
+}