GUI: When dialogs gain focus, inform them of the current mouse position

Previously, they only reacted to the mouse position once it was moved.
This meant that if the cursor was on a button that just gained focus,
it did not highlight.

Fixes #7101.

1 files changed, 2 insertions, 0 deletions

diff --git a/gui/dialog.cpp b/gui/dialog.cpp
index 315c24e9bf..075a3bb533 100644
--- a/gui/dialog.cpp
+++ b/gui/dialog.cpp
@@ -119,6 +119,8 @@ void Dialog::reflowLayout() {
 }
 
 void Dialog::lostFocus() {
+	_dragWidget = NULL;
+
 	if (_tickleWidget) {
 		_tickleWidget->lostFocus();
 	}