Fix #7004: Mark linkgraph dirty to be rebuilt on next draw call. (#7265)

Previously the linkgraph was rebuilt before the viewport extents were finalized.

1 files changed, 5 insertions, 1 deletions

diff --git a/src/linkgraph/linkgraph_gui.cpp b/src/linkgraph/linkgraph_gui.cpp
index 7923fc26c..4db9f95b3 100644
--- a/src/linkgraph/linkgraph_gui.cpp
+++ b/src/linkgraph/linkgraph_gui.cpp
@@ -239,8 +239,12 @@ void LinkGraphOverlay::AddLinks(const Station *from, const Station *to)
  * Draw the linkgraph overlay or some part of it, in the area given.
  * @param dpi Area to be drawn to.
  */
-void LinkGraphOverlay::Draw(const DrawPixelInfo *dpi) const
+void LinkGraphOverlay::Draw(const DrawPixelInfo *dpi)
 {
+	if (this->dirty) {
+		this->RebuildCache();
+		this->dirty = false;
+	}
 	this->DrawLinks(dpi);
 	this->DrawStationDots(dpi);
 }