Clamp m_anchor in mouse handler, nothing garantees that it is still valid

Fixes #350

1 files changed, 6 insertions, 3 deletions

diff --git a/src/input_handler.cc b/src/input_handler.cc
index 2ab3f98c..cefe65b1 100644
--- a/src/input_handler.cc
+++ b/src/input_handler.cc
@@ -72,11 +72,12 @@ struct MouseHandler
         if (not context.has_window())
             return false;
 
+        Buffer& buffer = context.buffer();
         if (key.modifiers == Key::Modifiers::MousePress)
         {
             m_dragging = true;
             m_anchor = context.window().buffer_coord(key.mouse_coord());
-            context.selections_write_only() = SelectionList{ context.buffer(), m_anchor };
+            context.selections_write_only() = SelectionList{ buffer, m_anchor };
             return true;
         }
         if (key.modifiers == Key::Modifiers::MouseRelease)
@@ -85,7 +86,8 @@ struct MouseHandler
                 return true;
             m_dragging = false;
             auto cursor = context.window().buffer_coord(key.mouse_coord());
-            context.selections_write_only() = SelectionList{ context.buffer(), Selection{m_anchor, cursor} };
+            context.selections_write_only() =
+                SelectionList{ buffer, Selection{buffer.clamp(m_anchor), cursor} };
             return true;
         }
         if (key.modifiers == Key::Modifiers::MousePos)
@@ -93,7 +95,8 @@ struct MouseHandler
             if (not m_dragging)
                 return true;
             auto cursor = context.window().buffer_coord(key.mouse_coord());
-            context.selections_write_only() = SelectionList{ context.buffer(), Selection{m_anchor, cursor} };
+            context.selections_write_only() =
+                SelectionList{ buffer, Selection{buffer.clamp(m_anchor), cursor} };
             return true;
         }
         if (key.modifiers == Key::Modifiers::MouseWheelDown)