Continue Caps Word when AltGr (right Alt) is held. (#17156)

This is a minor bug fix for Caps Word. Currently, Caps Word turns off
whenever a non-shift mod becomes active. This is done to avoid
interfering with hotkeys.

This commit makes an exception to continue Caps Word when AltGr (right
Alt) is held. Outside the US, the AltGr key is used to type additional
symbols (https://en.wikipedia.org/wiki/AltGr_key). Depending on the
language, these may include symbols used within words like accented
letters where it would be desirable to continue Caps Word.

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/caps_word/test_caps_word.cpp b/tests/caps_word/test_caps_word.cpp
index bcc8c53326..f611d4c104 100644
--- a/tests/caps_word/test_caps_word.cpp
+++ b/tests/caps_word/test_caps_word.cpp
@@ -212,6 +212,36 @@ TEST_F(CapsWord, SpaceTurnsOffCapsWord) {
     testing::Mock::VerifyAndClearExpectations(&driver);
 }
 
+// Tests that typing "AltGr + A" produces "Shift + AltGr + A".
+TEST_F(CapsWord, ShiftsAltGrSymbols) {
+    TestDriver driver;
+    KeymapKey  key_a(0, 0, 0, KC_A);
+    KeymapKey  key_altgr(0, 1, 0, KC_RALT);
+    set_keymap({key_a, key_altgr});
+
+    // Allow any number of reports with no keys or only modifiers.
+    // clang-format off
+    EXPECT_CALL(driver, send_keyboard_mock(AnyOf(
+                KeyboardReport(),
+                KeyboardReport(KC_RALT),
+                KeyboardReport(KC_LSFT, KC_RALT))))
+        .Times(AnyNumber());
+    // Expect "Shift + AltGr + A, Space".
+    EXPECT_CALL(driver, send_keyboard_mock(KeyboardReport(KC_LSFT, KC_RALT, KC_A)));
+    // clang-format on
+
+    // Turn on Caps Word and type "AltGr + A".
+    caps_word_on();
+
+    key_altgr.press();
+    run_one_scan_loop();
+    TapKeys(key_a);
+    run_one_scan_loop();
+    key_altgr.release();
+
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
 struct CapsWordBothShiftsParams {
     std::string name;
     uint16_t    left_shift_keycode;