GTK Shell: Manually retrieve textual data from clipboard

CHANGELOG.md

@@ -48,6 +48,7 @@ You can find its changes [documented below](#070---2021-01-01).
 ### Fixed
 - `Notification`s will not be delivered to the widget that sends them ([#1640] by [@cmyr])
 - `TextBox` can handle standard keyboard shortcuts without needing menus ([#1660] by [@cmyr])
+- GTK Shell: Prevent mangling of newline characters in clipboard ([#1695] by [@ForLoveOfCats])
 
 
 - Fixed docs of derived Lens ([#1523] by [@Maan2003])
@@ -661,6 +662,7 @@ Last release without a changelog :(
 [#1662]: https://github.com/linebender/druid/pull/1662
 [#1677]: https://github.com/linebender/druid/pull/1677
 [#1698]: https://github.com/linebender/druid/pull/1698
+[#1695]: https://github.com/linebender/druid/pull/1695
 
 [Unreleased]: https://github.com/linebender/druid/compare/v0.7.0...master
 [0.7.0]: https://github.com/linebender/druid/compare/v0.6.0...v0.7.0

druid-shell/src/platform/gtk/clipboard.rs

@@ -62,7 +62,25 @@ impl Clipboard {
     pub fn get_string(&self) -> Option<String> {
         let display = gdk::Display::get_default().unwrap();
         let clipboard = gtk::Clipboard::get_default(&display).unwrap();
-        clipboard.wait_for_text().map(|s| s.to_string())
+
+        let targets = [
+            "UTF8_STRING",
+            "TEXT",
+            "STRING",
+            "text/plain;charset=utf-8",
+            "text/plain",
+        ];
+
+        for target in &targets {
+            let atom = Atom::intern(target);
+            if let Some(selection) = clipboard.wait_for_contents(&atom) {
+                return std::str::from_utf8(&selection.get_data())
+                    .ok()
+                    .map(|text| text.to_string());
+            }
+        }
+
+        None
     }
 
     /// Given a list of supported clipboard types, returns the supported type which has