LibGUI: Only redraw sliders after the `on_change` callback has finished

This prevents the seek slider in VideoPlayer from skipping forward and
then back when fast seeking is enabled. Previously, it was possible for
a single frame to render before the actual seek position in the seek
bar was set.

1 files changed, 1 insertions, 2 deletions

diff --git a/Userland/Libraries/LibGUI/AbstractSlider.cpp b/Userland/Libraries/LibGUI/AbstractSlider.cpp
index 4f1442a0da..4a45a5c674 100644
--- a/Userland/Libraries/LibGUI/AbstractSlider.cpp
+++ b/Userland/Libraries/LibGUI/AbstractSlider.cpp
@@ -57,10 +57,9 @@ void AbstractSlider::set_value(int value, AllowCallback allow_callback, DoClamp
     if (m_value == value)
         return;
     m_value = value;
-    update();
-
     if (on_change && allow_callback == AllowCallback::Yes)
         on_change(m_value);
+    update();
 }
 
 }