servo: Merge #20089 - Revert previously merged code, better implementation for Default selectionStart and selectionEnd (from paavininanda:RevertChanges); r=jdm

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [x] There are tests for these changes

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

Source-Repo: https://github.com/servo/servo
Source-Revision: 0fa324872330715140c86e5125640ef23e8b072b

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 8c899d232d8559a68f2569c0f533bc2153b9708e

servo/components/script/dom/htmlformelement.rs

@@ -651,7 +651,7 @@ impl HTMLFormElement {
                     child.downcast::<HTMLSelectElement>().unwrap().reset();
                 }
                 NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLTextAreaElement)) => {
-                    child.downcast::<HTMLTextAreaElement>().unwrap().reset(true);
+                    child.downcast::<HTMLTextAreaElement>().unwrap().reset();
                 }
                 NodeTypeId::Element(ElementTypeId::HTMLElement(HTMLElementTypeId::HTMLOutputElement)) => {
                     // Unimplemented

servo/components/script/dom/htmlinputelement.rs

@@ -550,8 +550,43 @@ impl HTMLInputElementMethods for HTMLInputElement {
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-input-value
-    fn SetValue(&self, value: DOMString) -> ErrorResult {
-        self.update_text_contents(value, true)
+    fn SetValue(&self, mut value: DOMString) -> ErrorResult {
+        match self.value_mode() {
+            ValueMode::Value => {
+                // Step 3.
+                self.value_dirty.set(true);
+
+                // Step 4.
+                 self.sanitize_value(&mut value);
+
+                let mut textinput = self.textinput.borrow_mut();
+
+                // Step 5.
+                if *textinput.single_line_content() != value {
+                    // Steps 1-2
+                    textinput.set_content(value);
+
+                    // Step 5.
+                    textinput.clear_selection_to_limit(Direction::Forward);
+                }
+            }
+            ValueMode::Default |
+            ValueMode::DefaultOn => {
+                self.upcast::<Element>().set_string_attribute(&local_name!("value"), value);
+            }
+            ValueMode::Filename => {
+                if value.is_empty() {
+                    let window = window_from_node(self);
+                    let fl = FileList::new(&window, vec![]);
+                    self.filelist.set(Some(&fl));
+                } else {
+                    return Err(Error::InvalidState);
+                }
+            }
+        }
+
+        self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
+        Ok(())
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-input-defaultvalue
@@ -906,9 +941,7 @@ impl HTMLInputElement {
             InputType::Image => (),
             _ => ()
         }
-
-        self.update_text_contents(self.DefaultValue(), true)
-            .expect("Failed to reset input value to default.");
+        self.textinput.borrow_mut().set_content(self.DefaultValue());
         self.value_dirty.set(false);
         self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
     }
@@ -1056,44 +1089,6 @@ impl HTMLInputElement {
     fn selection(&self) -> TextControlSelection<Self> {
         TextControlSelection::new(&self, &self.textinput)
     }
-
-    fn update_text_contents(&self, mut value: DOMString, update_text_cursor: bool) -> ErrorResult {
-        match self.value_mode() {
-            ValueMode::Value => {
-                // Step 3.
-                self.value_dirty.set(true);
-
-                // Step 4.
-                self.sanitize_value(&mut value);
-
-                let mut textinput = self.textinput.borrow_mut();
-
-                if *textinput.single_line_content() != value {
-                    // Steps 1-2
-                    textinput.set_content(value, update_text_cursor);
-
-                    // Step 5.
-                    textinput.clear_selection_to_limit(Direction::Forward, update_text_cursor);
-                }
-            }
-            ValueMode::Default |
-            ValueMode::DefaultOn => {
-                self.upcast::<Element>().set_string_attribute(&local_name!("value"), value);
-            }
-            ValueMode::Filename => {
-                if value.is_empty() {
-                    let window = window_from_node(self);
-                    let fl = FileList::new(&window, vec![]);
-                    self.filelist.set(Some(&fl));
-                } else {
-                    return Err(Error::InvalidState);
-                }
-            }
-        }
-
-        self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
-        Ok(())
-    }
 }
 
 impl VirtualMethods for HTMLInputElement {
@@ -1203,11 +1198,11 @@ impl VirtualMethods for HTMLInputElement {
                         let mut textinput = self.textinput.borrow_mut();
                         let mut value = textinput.single_line_content().clone();
                         self.sanitize_value(&mut value);
-                        textinput.set_content(value, true);
+                        textinput.set_content(value);
 
                         // Steps 7-9
                         if !previously_selectable && self.selection_api_applies() {
-                            textinput.clear_selection_to_limit(Direction::Backward, true);
+                            textinput.clear_selection_to_limit(Direction::Backward);
                         }
                     },
                     AttributeMutation::Removed => {
@@ -1231,7 +1226,7 @@ impl VirtualMethods for HTMLInputElement {
                 let mut value = value.map_or(DOMString::new(), DOMString::from);
 
                 self.sanitize_value(&mut value);
-                self.textinput.borrow_mut().set_content(value, true);
+                self.textinput.borrow_mut().set_content(value);
                 self.update_placeholder_shown_state();
             },
             &local_name!("name") if self.input_type() == InputType::Radio => {

servo/components/script/dom/htmltextareaelement.rs

@@ -233,7 +233,7 @@ impl HTMLTextAreaElementMethods for HTMLTextAreaElement {
         // if the element's dirty value flag is false, then the element's
         // raw value must be set to the value of the element's textContent IDL attribute
         if !self.value_dirty.get() {
-            self.reset(false);
+            self.reset();
         }
     }
 
@@ -244,7 +244,23 @@ impl HTMLTextAreaElementMethods for HTMLTextAreaElement {
 
     // https://html.spec.whatwg.org/multipage/#dom-textarea-value
     fn SetValue(&self, value: DOMString) {
-        self.update_text_contents(value, true);
+        let mut textinput = self.textinput.borrow_mut();
+
+        // Step 1
+        let old_value = textinput.get_content();
+
+        // Step 2
+        textinput.set_content(value);
+
+        // Step 3
+        self.value_dirty.set(true);
+
+        if old_value != textinput.get_content() {
+            // Step 4
+            textinput.clear_selection_to_limit(Direction::Forward);
+        }
+
+        self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
     }
 
     // https://html.spec.whatwg.org/multipage/#dom-lfe-labels
@@ -306,9 +322,10 @@ impl HTMLTextAreaElementMethods for HTMLTextAreaElement {
 
 
 impl HTMLTextAreaElement {
-    pub fn reset(&self,  update_text_cursor: bool) {
+    pub fn reset(&self) {
         // https://html.spec.whatwg.org/multipage/#the-textarea-element:concept-form-reset-control
-        self.update_text_contents(self.DefaultValue(), update_text_cursor);
+        let mut textinput = self.textinput.borrow_mut();
+        textinput.set_content(self.DefaultValue());
         self.value_dirty.set(false);
     }
 
@@ -316,27 +333,6 @@ impl HTMLTextAreaElement {
     fn selection(&self) -> TextControlSelection<Self> {
         TextControlSelection::new(&self, &self.textinput)
     }
-
-    // Helper function to check if text_cursor is to be updated or not
-    fn update_text_contents(&self, value: DOMString, update_text_cursor: bool) {
-        let mut textinput = self.textinput.borrow_mut();
-
-        // Step 1
-        let old_value = textinput.get_content();
-
-        // Step 2
-        textinput.set_content(value, update_text_cursor);
-
-        // Step 3
-        self.value_dirty.set(true);
-
-        if old_value != textinput.get_content() {
-            // Step 4
-            textinput.clear_selection_to_limit(Direction::Forward, update_text_cursor);
-        }
-
-        self.upcast::<Node>().dirty(NodeDamage::OtherNodeDamage);
-    }
 }
 
 
@@ -429,7 +425,7 @@ impl VirtualMethods for HTMLTextAreaElement {
             s.children_changed(mutation);
         }
         if !self.value_dirty.get() {
-            self.reset(false);
+            self.reset();
         }
     }
 
@@ -480,7 +476,7 @@ impl VirtualMethods for HTMLTextAreaElement {
         self.super_type().unwrap().pop();
 
         // https://html.spec.whatwg.org/multipage/#the-textarea-element:stack-of-open-elements
-        self.reset(false);
+        self.reset();
     }
 }
 

servo/components/script/textinput.rs

@@ -188,7 +188,7 @@ impl<T: ClipboardProvider> TextInput<T> {
             min_length: min_length,
             selection_direction: selection_direction,
         };
-        i.set_content(initial, false);
+        i.set_content(initial);
         i
     }
 
@@ -568,9 +568,9 @@ impl<T: ClipboardProvider> TextInput<T> {
     }
 
     /// Remove the current selection and set the edit point to the end of the content.
-    pub fn clear_selection_to_limit(&mut self, direction: Direction, update_text_cursor: bool) {
+    pub fn clear_selection_to_limit(&mut self, direction: Direction) {
         self.clear_selection();
-        self.adjust_horizontal_to_limit(direction, Selection::NotSelected, update_text_cursor);
+        self.adjust_horizontal_to_limit(direction, Selection::NotSelected);
     }
 
     pub fn adjust_horizontal_by_word(&mut self, direction: Direction, select: Selection) {
@@ -662,20 +662,18 @@ impl<T: ClipboardProvider> TextInput<T> {
         self.perform_horizontal_adjustment(shift, select);
     }
 
-    pub fn adjust_horizontal_to_limit(&mut self, direction: Direction, select: Selection, update_text_cursor: bool) {
+    pub fn adjust_horizontal_to_limit(&mut self, direction: Direction, select: Selection) {
         if self.adjust_selection_for_horizontal_change(direction, select) {
             return
         }
-        if update_text_cursor {
-            match direction {
-                Direction::Backward => {
-                    self.edit_point.line = 0;
-                    self.edit_point.index = 0;
-                },
-                Direction::Forward => {
-                    self.edit_point.line = &self.lines.len() - 1;
-                    self.edit_point.index = (&self.lines[&self.lines.len() - 1]).len();
-                }
+        match direction {
+            Direction::Backward => {
+                self.edit_point.line = 0;
+                self.edit_point.index = 0;
+            },
+            Direction::Forward => {
+                self.edit_point.line = &self.lines.len() - 1;
+                self.edit_point.index = (&self.lines[&self.lines.len() - 1]).len();
             }
         }
     }
@@ -765,12 +763,12 @@ impl<T: ClipboardProvider> TextInput<T> {
             },
             #[cfg(target_os = "macos")]
             (None, Key::Up) if mods.contains(KeyModifiers::SUPER) => {
-                self.adjust_horizontal_to_limit(Direction::Backward, maybe_select, true);
+                self.adjust_horizontal_to_limit(Direction::Backward, maybe_select);
                 KeyReaction::RedrawSelection
             },
             #[cfg(target_os = "macos")]
             (None, Key::Down) if mods.contains(KeyModifiers::SUPER) => {
-                self.adjust_horizontal_to_limit(Direction::Forward, maybe_select, true);
+                self.adjust_horizontal_to_limit(Direction::Forward, maybe_select);
                 KeyReaction::RedrawSelection
             },
             (None, Key::Left) if mods.contains(KeyModifiers::ALT) => {
@@ -871,7 +869,7 @@ impl<T: ClipboardProvider> TextInput<T> {
 
     /// Set the current contents of the text input. If this is control supports multiple lines,
     /// any \n encountered will be stripped and force a new logical line.
-    pub fn set_content(&mut self, content: DOMString, update_text_cursor: bool) {
+    pub fn set_content(&mut self, content: DOMString) {
         self.lines = if self.multiline {
             // https://html.spec.whatwg.org/multipage/#textarea-line-break-normalisation-transformation
             content.replace("\r\n", "\n")
@@ -882,14 +880,11 @@ impl<T: ClipboardProvider> TextInput<T> {
             vec!(content)
         };
 
-        if update_text_cursor {
-            self.edit_point = self.edit_point.constrain_to(&self.lines);
-        }
+        self.edit_point = self.edit_point.constrain_to(&self.lines);
 
         if let Some(origin) = self.selection_origin {
             self.selection_origin = Some(origin.constrain_to(&self.lines));
         }
-
         self.assert_ok_selection();
     }
 

servo/tests/unit/script/textinput.rs

@@ -27,7 +27,7 @@ fn test_set_content_ignores_max_length() {
         Lines::Single, DOMString::from(""), DummyClipboardContext::new(""), Some(1), None, SelectionDirection::None
     );
 
-    textinput.set_content(DOMString::from("mozilla rocks"), true);
+    textinput.set_content(DOMString::from("mozilla rocks"));
     assert_eq!(textinput.get_content(), DOMString::from("mozilla rocks"));
 }
 
@@ -489,15 +489,16 @@ fn test_textinput_set_content() {
     let mut textinput = text_input(Lines::Multiple, "abc\nde\nf");
     assert_eq!(textinput.get_content(), "abc\nde\nf");
 
-    textinput.set_content(DOMString::from("abc\nf"), true);
+    textinput.set_content(DOMString::from("abc\nf"));
     assert_eq!(textinput.get_content(), "abc\nf");
 
     assert_eq!(textinput.edit_point().line, 0);
     assert_eq!(textinput.edit_point().index, 0);
+
     textinput.adjust_horizontal(3, Selection::Selected);
     assert_eq!(textinput.edit_point().line, 0);
     assert_eq!(textinput.edit_point().index, 3);
-    textinput.set_content(DOMString::from("de"), true);
+    textinput.set_content(DOMString::from("de"));
     assert_eq!(textinput.get_content(), "de");
     assert_eq!(textinput.edit_point().line, 0);
     assert_eq!(textinput.edit_point().index, 2);