bug 1502864: geckodriver: support strictFileInteractability; r=jgraham

The strictFileInteractability capability is always supported by
geckodriver.

Depends on D10273

Depends on D10273

Differential Revision: https://phabricator.services.mozilla.com/D10274

--HG--
extra : moz-landing-system : lando

testing/geckodriver/CHANGES.md

@@ -9,9 +9,29 @@ Unreleased
 
 ### Added
 
+- Introduces `strictFileInteractability` capability
+
+  The new capabilitiy indicates if strict interactability checks
+  should be applied to `<input type=file>` elements.  As strict
+  interactability checks are off by default, there is a change
+  in behaviour when using [Element Send Keys] with hidden file
+  upload controls.
+
 - Added new endpoint `GET /session/{session id}/moz/screenshot/full`
   for taking full document screenshots, thanks to Greg Fraley.
 
+# Changed
+
+- Allow file uploads to hidden `<input type=file>` elements
+
+  Through a series of changes to the WebDriver specification,
+  geckodriver is now aligned with chromedriver’s behaviour that
+  allows interaction with hidden `<input type=file>` elements.
+
+  This allows WebDriver to be used with various popular web frameworks
+  that—through indirection—hides the file upload control and
+  invokes it through other means.
+
 
 0.23.0 (2018-10-03)
 -------------------

testing/geckodriver/src/capabilities.rs

@@ -156,6 +156,10 @@ impl<'a> BrowserCapabilities for FirefoxCapabilities<'a> {
             .or_else(|x| Err(convert_version_error(x)))
     }
 
+    fn strict_file_interactability(&mut self, _: &Capabilities) -> WebDriverResult<bool> {
+        Ok(true)
+    }
+
     fn accept_proxy(&mut self, _: &Capabilities, _: &Capabilities) -> WebDriverResult<bool> {
         Ok(true)
     }