Relayout text input elements on blur

components/layout/wrapper.rs

@@ -957,9 +957,10 @@ impl<'ln> ThreadSafeLayoutNode<'ln> for ServoThreadSafeLayoutNode<'ln> {
         };
 
         if let Some(area) = this.downcast::<HTMLTextAreaElement>() {
-            let insertion_point = unsafe { area.get_absolute_insertion_point_for_layout() };
-            let text = unsafe { area.get_value_for_layout() };
-            return Some(CharIndex(search_index(insertion_point, text.char_indices())));
+            if let Some(insertion_point) = unsafe { area.get_absolute_insertion_point_for_layout() } {
+                let text = unsafe { area.get_value_for_layout() };
+                return Some(CharIndex(search_index(insertion_point, text.char_indices())));
+            }
         }
         if let Some(input) = this.downcast::<HTMLInputElement>() {
             let insertion_point_index = unsafe { input.get_insertion_point_index_for_layout() };

components/script/dom/document.rs

@@ -72,6 +72,7 @@ use dom::touchevent::TouchEvent;
 use dom::touchlist::TouchList;
 use dom::treewalker::TreeWalker;
 use dom::uievent::UIEvent;
+use dom::virtualmethods::{VirtualMethods, vtable_for};
 use dom::window::{ReflowReason, Window};
 use euclid::point::Point2D;
 use html5ever::tree_builder::{LimitedQuirks, NoQuirks, Quirks, QuirksMode};
@@ -593,6 +594,8 @@ impl Document {
 
         if let Some(ref elem) = self.focused.get() {
             elem.set_focus_state(false);
+            let node = vtable_for(&elem.upcast::<Node>());
+            node.handle_blur();
         }
 
         self.focused.set(self.possibly_focused.get().r());

components/script/dom/htmlinputelement.rs

@@ -208,6 +208,9 @@ impl LayoutHTMLInputElementHelpers for LayoutJS<HTMLInputElement> {
     #[allow(unrooted_must_root)]
     #[allow(unsafe_code)]
     unsafe fn get_insertion_point_index_for_layout(self) -> Option<isize> {
+        if !(*self.unsafe_get()).upcast::<Element>().get_focus_state() {
+            return None;
+        }
         match (*self.unsafe_get()).input_type.get() {
             InputType::InputText  => {
                 let raw = self.get_value_for_layout();
@@ -716,6 +719,13 @@ impl VirtualMethods for HTMLInputElement {
                 }
         }
     }
+
+    fn handle_blur(&self) {
+        if let Some(s) = self.super_type() {
+            s.handle_blur();
+        }
+        self.force_relayout();
+    }
 }
 
 impl FormControl for HTMLInputElement {}

components/script/dom/htmltextareaelement.rs

@@ -45,7 +45,7 @@ pub trait LayoutHTMLTextAreaElementHelpers {
     #[allow(unsafe_code)]
     unsafe fn get_value_for_layout(self) -> String;
     #[allow(unsafe_code)]
-    unsafe fn get_absolute_insertion_point_for_layout(self) -> usize;
+    unsafe fn get_absolute_insertion_point_for_layout(self) -> Option<usize>;
     #[allow(unsafe_code)]
     fn get_cols(self) -> u32;
     #[allow(unsafe_code)]
@@ -61,8 +61,13 @@ impl LayoutHTMLTextAreaElementHelpers for LayoutJS<HTMLTextAreaElement> {
 
     #[allow(unrooted_must_root)]
     #[allow(unsafe_code)]
-    unsafe fn get_absolute_insertion_point_for_layout(self) -> usize {
-        (*self.unsafe_get()).textinput.borrow_for_layout().get_absolute_insertion_point()
+    unsafe fn get_absolute_insertion_point_for_layout(self) -> Option<usize> {
+        if (*self.unsafe_get()).upcast::<Element>().get_focus_state() {
+            Some((*self.unsafe_get()).textinput.borrow_for_layout()
+                                      .get_absolute_insertion_point())
+        } else {
+            None
+        }
     }
 
     #[allow(unsafe_code)]

components/script/dom/virtualmethods.rs

@@ -102,6 +102,14 @@ pub trait VirtualMethods {
         }
     }
 
+    /// Called when a previously focused element is no longer focused.
+    /// Use this to trigger relayouts
+    fn handle_blur(&self) {
+        if let Some(s) = self.super_type() {
+            s.handle_blur();
+        }
+    }
+
     /// https://dom.spec.whatwg.org/#concept-node-adopt-ext
     fn adopting_steps(&self, old_doc: &Document) {
         if let Some(ref s) = self.super_type() {