Fix image references and update control & selection bounds methods (#112)

This PR updates the image references and replaces the `updateLayout` method with `updateControlBounds` & `updateSelectionBounds` methods in the explainer.

Author: ashishkum-ms

dev-design.md

@@ -1,6 +1,6 @@
 # Developer Design
 
-![shared text](shared_text_basic.png)
+![shared text](images/shared_text_basic.png)
 
 1. The typical flow of text input comes from the user pressing keys on the keyboard. 
 2. These are delivered to the browser, which opted-in to using the system's text services framework in order to integrate with the IMEs installed on the system. This will cause input to be forwarded to the active IME. 
@@ -33,7 +33,7 @@ Note that the composition events are also not fired on the focused element as th
 
 Changes to the editable contents can also come from external events, such as collaboration scenarios. In this case, the web editing framework may get some XHR completion that notifies it of some pending collaboartive change that another user has committed. The framework is then responsible for writing to the shared buffer, via the ```updateText()``` method.
 
-![external input](external_input.png)
+![external input](images/external_input.png)
 
 ## API Details
 
@@ -74,7 +74,7 @@ enum EditContextInputPolicy { "auto", "manual" }
 ```
 
 ### Renderer process IME components:
-![Renderer process communication](renderer_process_comm.png)
+![Renderer process communication](images/renderer_process_comm.png)
 
 1. WidgetInputHandlerImpl: Receives the IME messages in the IO thread and posts it to the main thread of the renderer process. 
 2. It is then received by the RenderWidget that sends it to the WebInputMethodControllerImpl to decide which component should handle the IME event and fire the corresponding JS event.
@@ -83,12 +83,12 @@ enum EditContextInputPolicy { "auto", "manual" }
 5. If EditContext is in focus, then it updates the internal states and fires the corresponding events to JS.
 
 ### EditContext:
-![Class diagram](edit_context_class_design.png)
+![Class diagram](images/edit_context_class_design.png)
 
 This class implements the WebInputMethodController interface and is also the event target for various JS events that get fired based on the IME and English typing events. The lifetime of the EditContext is managed by the Document. There can be multiple EditContext for an active document but only one can be focused at a time. The EditContext JS events are fired whenever there is an active composition. EditContext also maintains internal states that get updated during these input events. These internal states are used to communicate changes to the text input services that might affect their text view of the edit control.
 
 ### Synchronization mechanism
-![Synchronization mechanism](edit_context_state_sync.png)
+![Synchronization mechanism](images/edit_context_state_sync.png)
 
 1. EditContext's state can be manipulated by either text input services or JS authors. This state is kept in sync with the text input services via TextInputState data object. This TextInputState object contains the data that is required by the text input services to synchronize their text view and provide meaningful suggestions and other text input intelligence operation.
 2. The TextInputState object is updated on every lifecycle update(BeginMainFrame) which gets invoked right before the paint happens. This TextInputState object is updated from EditContext if it has focus, else, it is updated from InputMethodController and then sent by RenderWidget to the browser process through the IPC mechanism.

explainer.md

@@ -156,7 +156,7 @@ interface EditContext : EventTarget {
 ```
 ## Difference between Contenteditable element and the EditContext element.
 
-![contenteditable_vs_editcontext](contentEditable_vs_editContext.png)
+![contenteditable_vs_editcontext](images/contentEditable_vs_editContext.png)
 
 One can think of a div with Contenteditable (on the left in the above figure) as a div with a built-in EditContext which maintains a plain text buffer that serves as a plain text view (or IME-facing view) to communicate with various text input services (ex. IME, handwriting recognition, speech detection, etc.) When users initiate text inputs, the text input services will update the plain text buffer through the plain text view. The built-in EditContext then sends internal events to the div which takes the plain text buffer as part of its own model and updates the DOM, which serves as a user-facing view, based on some default editing behaviors defined by the brower.
 
@@ -247,7 +247,8 @@ The following table summarizes the difference between div with contentEditable a
         let controlBound = editView.getBoundingClientRect();
         let s = document.getSelection();
         let selectionBound = s.getRangeAt(0).getBoundingClientRect();
-        editContext.updateLayout(controlBound, selectionBound);
+        editContext.updateControlBounds(controlBound);
+        editContext.updateSelectionBounds(selectionBound);
 ```
 
 ## Example Application
@@ -329,18 +330,18 @@ Multiple approaches have been discussed during F2F editing meetings and through
 # Appendix
 ## Example Text Input Methods
 ### Virtual Keyboard Shape-writing
-![VK shape-writing](Shape-writing.gif)
+![VK shape-writing](images/Shape-writing.gif)
 
 ### Handwriting Recognition
-![Handwriting Recognition](Handwriting-recognition.gif)
+![Handwriting Recognition](images/Handwriting-recognition.gif)
 
 ### Emoji Picker
-![Emoji Picker](Emoji-picker.gif)
+![Emoji Picker](images/Emoji-picker.gif)
 
 ### IME Composition
-![IME Compositions](Composition.gif)
+![IME Compositions](images/Composition.gif)
 
 ### Dictation
-![Dictation](dictation.png)
+![Dictation](images/dictation.png)
 ---
 [Related issues](https://github.com/MicrosoftEdge/MSEdgeExplainers/labels/EditContext) | [Open a new issue](https://github.com/MicrosoftEdge/MSEdgeExplainers/issues/new?title=%5BEditContext%5D)