Relocate during replace

Fixes #1587

internal/action/command.go

@@ -762,6 +762,8 @@ func (h *BufPane) ReplaceCmd(args []string) {
 			h.Cursor.SetSelectionStart(locs[0])
 			h.Cursor.SetSelectionEnd(locs[1])
 
+			h.Relocate()
+
 			InfoBar.YNPrompt("Perform replacement (y,n,esc)", func(yes, canceled bool) {
 				if !canceled && yes {
 					_, nrunes := h.Buf.ReplaceRegex(locs[0], locs[1], regex, replace)
@@ -786,6 +788,7 @@ func (h *BufPane) ReplaceCmd(args []string) {
 	}
 
 	h.Buf.RelocateCursors()
+	h.Relocate()
 
 	var s string
 	if nreplaced > 1 {

internal/display/bufwindow.go

@@ -139,6 +139,9 @@ func (w *BufWindow) Relocate() bool {
 	ret := false
 	activeC := w.Buf.GetActiveCursor()
 	cy := activeC.Y
+	if activeC.HasSelection() {
+		cy = activeC.CurSelection[0].Y
+	}
 	scrollmargin := int(b.Settings["scrollmargin"].(float64))
 	if cy < w.StartLine+scrollmargin && cy > scrollmargin-1 {
 		w.StartLine = cy - scrollmargin