input_method: Hide when input provided by application

src/imservice.rs

@@ -102,8 +102,12 @@ pub mod c {
         imservice.pending = IMProtocolState {
             content_hint: {
                 ContentHint::from_bits(hint).unwrap_or_else(|| {
-                    eprintln!("Warning: received invalid hint flags");
-                    ContentHint::NONE
+                    let out = ContentHint::from_bits_truncate(hint);
+                    eprintln!(
+                        "Warning: received hint flags with unknown bits set: 0x{:x}",
+                        hint ^ out.bits(),
+                    );
+                    out
                 })
             },
             content_purpose: {
@@ -142,19 +146,34 @@ pub mod c {
         let imservice = check_imservice(imservice, im).unwrap();
         let active_changed = imservice.current.active ^ imservice.pending.active;
 
+        fn is_visible(state: &IMProtocolState) -> bool {
+            state.active
+                && !state.content_hint.contains(
+                    ContentHint::ON_SCREEN_INPUT_PROVIDED
+                )
+        }
+
+        let visible_changed = is_visible(&imservice.current)
+            ^ is_visible(&imservice.pending);
+        
         imservice.serial += Wrapping(1u32);
         imservice.current = imservice.pending.clone();
         imservice.pending = IMProtocolState {
             active: imservice.current.active,
             ..IMProtocolState::default()
         };
-        if active_changed {
-            if imservice.current.active {
-                eekboard_context_service_show_keyboard(imservice.ui_manager);
+
+        if active_changed && imservice.current.active {
             eekboard_context_service_set_hint_purpose(
                 imservice.ui_manager,
                 imservice.current.content_hint.bits(),
-                    imservice.current.content_purpose.clone() as u32);
+                imservice.current.content_purpose.clone() as u32,
+            );
+        }
+        
+        if visible_changed {
+            if is_visible(&imservice.current) {
+                eekboard_context_service_show_keyboard(imservice.ui_manager);
             } else {
                 eekboard_context_service_hide_keyboard(imservice.ui_manager);
             }
@@ -219,6 +238,7 @@ bitflags!{
         const SENSITIVE_DATA = 0x80;
         const LATIN = 0x100;
         const MULTILINE = 0x200;
+        const ON_SCREEN_INPUT_PROVIDED = 0x400;
     }
 }