shithub: mongrel

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ensure selected message is visible in index when opening pager

	the selected message could end up hidden by the pager if it was after the top 10 lines
	which is the default number of lines that remain visible when collapsing the index.
	We now scroll to make sure the selected message is in the visible range of the index.

--- a/index.c

+++ b/index.c

@@ -73,7 +73,19 @@

 	mbox = mb;

 }

+void

+ensureselvisible(void)

+{

+	int n;

+	if(sel > offset && sel < offset + nlines)

+		return;

+	offset = nlines*(sel/nlines);

+	n = mbox->list->nelts;

+	if(offset + n%nlines >= n)

+		offset = n - n%nlines;

+}

+

 Message*

 messageat(int index)

 {

@@ -189,6 +201,7 @@

 	listr.min.x += Scrollwidth + Scrollgap;

 	listr.max.x -= Padding;

 	nlines = Dy(viewr) / lineh;

+	ensureselvisible();

 	return viewr;

 }

@@ -244,8 +257,6 @@

 void

 select(int newsel, Channel *c)

 {

-	int n;

-

 	if(newsel < 0)

 		newsel = 0;

 	if(newsel >= mbox->count)

@@ -254,10 +265,7 @@

 		return;

 	if(newsel < offset || newsel >= offset + nlines){

 		sel = newsel;

-		offset = nlines*(sel/nlines);

-		n = mbox->list->nelts;

-		if(offset + n%nlines >= n)

-			offset = n - n%nlines;

+		ensureselvisible();

 		indexdraw();

 	}else{

 		drawmessage(sel, 0);