servo: Merge #8983 - Various textinput fixes (from Manishearth:cursors); r=jdm

- Currently the cursor sticks around if you click elsewhere. Now the text inputs are relayout-ed on blur.
 - Currently whitespace gets collapsed in text input (https://github.com/servo/servo/issues/8772). Not anymore.

Source-Repo: https://github.com/servo/servo
Source-Revision: 099beee85c02d391b854dc5e06da34f89df8b760

servo/components/layout/wrapper.rs

@@ -979,9 +979,10 @@ 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() };

servo/components/script/dom/element.rs

@@ -1910,7 +1910,9 @@ impl Element {
     }
 
     pub fn set_focus_state(&self, value: bool) {
-        self.set_state(IN_FOCUS_STATE, value)
+        self.set_state(IN_FOCUS_STATE, value);
+        let doc = document_from_node(self);
+        doc.content_changed(self.upcast(), NodeDamage::OtherNodeDamage);
     }
 
     pub fn get_hover_state(&self) -> bool {

servo/components/script/dom/htmlinputelement.rs

@@ -202,6 +202,9 @@ 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();

servo/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)]

servo/components/style/properties.mako.rs

@@ -6993,6 +6993,10 @@ pub fn modify_style_for_input_text(style: &mut Arc<ComputedValues>) {
     margin_style.margin_right = computed::LengthOrPercentageOrAuto::Length(Au(0));
     margin_style.margin_bottom = computed::LengthOrPercentageOrAuto::Length(Au(0));
     margin_style.margin_left = computed::LengthOrPercentageOrAuto::Length(Au(0));
+
+    // whitespace inside text input should not be collapsed
+    let inherited_text = Arc::make_mut(&mut style.inheritedtext);
+    inherited_text.white_space = longhands::white_space::computed_value::T::pre;
 }
 
 /// Adjusts the `clip` property so that an inline absolute hypothetical fragment doesn't clip its

servo/tests/html/input_whitespace_regression.html

@@ -0,0 +1,7 @@
+
+Both input elements below should have more than one space between "foo" and "bar":
+
+<form>
+<input value="foo     bar">
+<input value="foo&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;bar">
+</form>