From 4ae75259233a45583b6a0d73f1f7224cb50e0398 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <67731127+fxkuehl@users.noreply.github.com>
Date: Mon, 28 Nov 2022 03:16:38 -0500
Subject: Bug17281 - Retain momentary layers until the end of tapping (#17282)

* Make process_tapping more readable

Move most #ifdefs into conditionally defined macros to make the logic
easier to follow.

* Retain momentary layers until the end of tapping

This allows mod-tap and layer-tap keys on layers to behave as expected.

Bug: https://github.com/qmk/qmk_firmware/issues/17281

* Add tests for delayed mod/layer release while tapping

Mods and layer key release is delayed while tapping is in progress to
ensure that the tap is registered with the modifier state and on the
layer where the key was first pressed.

Signed-off-by: Felix Kuehling <felix.kuehling@gmail.com>
---
 tests/basic/test_tapping.cpp | 69 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

(limited to 'tests')

diff --git a/tests/basic/test_tapping.cpp b/tests/basic/test_tapping.cpp
index 6ff9cfe22b..faf9b9fe91 100644
--- a/tests/basic/test_tapping.cpp
+++ b/tests/basic/test_tapping.cpp
@@ -121,3 +121,72 @@ TEST_F(Tapping, ANewTapWithinTappingTermIsBuggy) {
     key_shift_hold_p_tap.release();
     run_one_scan_loop();
 }
+
+TEST_F(Tapping, TapA_CTL_T_KeyWhileReleasingShift) {
+    TestDriver driver;
+    InSequence s;
+    auto       shift_key        = KeymapKey(0, 7, 0, KC_LSFT);
+    auto       mod_tap_hold_key = KeymapKey(0, 8, 0, CTL_T(KC_P));
+
+    set_keymap({shift_key, mod_tap_hold_key});
+
+    shift_key.press();
+    // Shift is reported
+    EXPECT_REPORT(driver, (KC_LSFT));
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    mod_tap_hold_key.press();
+    // Tapping keys does nothing on press
+    EXPECT_NO_REPORT(driver);
+    run_one_scan_loop();
+
+    shift_key.release();
+    // Releasing shift is delayed while tapping is in progress
+    EXPECT_NO_REPORT(driver);
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    mod_tap_hold_key.release();
+    // Releasing mod-tap key reports the tap and releases shift
+    EXPECT_REPORT(driver, (KC_LSFT, KC_P));
+    EXPECT_REPORT(driver, (KC_P));
+    EXPECT_EMPTY_REPORT(driver);
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
+
+TEST_F(Tapping, TapA_CTL_T_KeyWhileReleasingLayer) {
+    TestDriver driver;
+    InSequence s;
+    auto       layer_key         = KeymapKey(0, 7, 0, MO(1));
+    auto       trans_key         = KeymapKey(1, 7, 0, KC_TRNS);
+    auto       mod_tap_hold_key0 = KeymapKey(0, 8, 0, CTL_T(KC_P));
+    auto       mod_tap_hold_key1 = KeymapKey(1, 8, 0, CTL_T(KC_Q));
+
+    set_keymap({layer_key, trans_key, mod_tap_hold_key0, mod_tap_hold_key1});
+
+    layer_key.press();
+    // Pressing the layer key does nothing
+    EXPECT_NO_REPORT(driver);
+    run_one_scan_loop();
+
+    mod_tap_hold_key1.press();
+    // Tapping layer 1 mod-tap key does nothing on press
+    EXPECT_NO_REPORT(driver);
+    run_one_scan_loop();
+
+    layer_key.release();
+    // Releasing layer is delayed while tapping is in progress
+    EXPECT_NO_REPORT(driver);
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+
+    mod_tap_hold_key1.release();
+    // Releasing mod-tap key reports the tap of the layer 1 key
+    // If delayed layer release is broken, this reports the layer 0 key
+    EXPECT_REPORT(driver, (KC_Q));
+    EXPECT_EMPTY_REPORT(driver);
+    run_one_scan_loop();
+    testing::Mock::VerifyAndClearExpectations(&driver);
+}
-- 
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