Make `PREVENT_STUCK_MODIFIERS` the default (#3107)

* Remove chording as it is not documented, not used, and needs work.

* Make Leader Key an optional feature.

* Switch from `PREVENT_STUCK_MODIFIERS` to `STRICT_LAYER_RELEASE`

* Remove `#define PREVENT_STUCK_MODIFIERS` from keymaps.

14 files changed, 8 insertions, 17 deletions

diff --git a/layouts/community/60_ansi/talljoe-ansi/config.h b/layouts/community/60_ansi/talljoe-ansi/config.h
index 1990b0ee3b..4326a2fd10 100644
--- a/layouts/community/60_ansi/talljoe-ansi/config.h
+++ b/layouts/community/60_ansi/talljoe-ansi/config.h
@@ -3,7 +3,6 @@
 
 #include QMK_KEYBOARD_CONFIG_H
 
-#define PREVENT_STUCK_MODIFIERS
 #define ENABLE_GAME_LAYER
 
 #define TEMPLATE(                                                                   \
diff --git a/layouts/community/60_ansi_split_bs_rshift/talljoe/config.h b/layouts/community/60_ansi_split_bs_rshift/talljoe/config.h
index 81ab5cf89e..bf18fd9f7d 100644
--- a/layouts/community/60_ansi_split_bs_rshift/talljoe/config.h
+++ b/layouts/community/60_ansi_split_bs_rshift/talljoe/config.h
@@ -3,7 +3,6 @@
 
 #include QMK_KEYBOARD_CONFIG_H
 
-#define PREVENT_STUCK_MODIFIERS
 #define ENABLE_GAME_LAYER
 
 #define TEMPLATE(                                                                   \
diff --git a/layouts/community/60_hhkb/talljoe-hhkb/config.h b/layouts/community/60_hhkb/talljoe-hhkb/config.h
index 938ea6cd63..9e907feeb5 100644
--- a/layouts/community/60_hhkb/talljoe-hhkb/config.h
+++ b/layouts/community/60_hhkb/talljoe-hhkb/config.h
@@ -3,7 +3,6 @@
 
 #include QMK_KEYBOARD_CONFIG_H
 
-#define PREVENT_STUCK_MODIFIERS
 #define ENABLE_GAME_LAYER
 
 #define TEMPLATE(                                                                   \
diff --git a/layouts/community/ergodox/adam/config.h b/layouts/community/ergodox/adam/config.h
index 21af8c6b8d..1a8fddb506 100644
--- a/layouts/community/ergodox/adam/config.h
+++ b/layouts/community/ergodox/adam/config.h
@@ -2,5 +2,4 @@
 
 #undef TAPPING_TERM
 #define TAPPING_TERM 300 //At 500 some bad logic takes hold
-#define PREVENT_STUCK_MODIFIERS
 #define IGNORE_MOD_TAP_INTERRUPT
diff --git a/layouts/community/ergodox/albert/rules.mk b/layouts/community/ergodox/albert/rules.mk
index fcd019e838..47549b50f6 100644
--- a/layouts/community/ergodox/albert/rules.mk
+++ b/layouts/community/ergodox/albert/rules.mk
@@ -1,3 +1,2 @@
 COMMAND_ENABLE = no        # Commands for debug and configuration
-
-
+LEADER_ENABLE = yes
diff --git a/layouts/community/ergodox/algernon/rules.mk b/layouts/community/ergodox/algernon/rules.mk
index f795a8676e..53dec5153a 100644
--- a/layouts/community/ergodox/algernon/rules.mk
+++ b/layouts/community/ergodox/algernon/rules.mk
@@ -8,6 +8,7 @@ TAP_DANCE_ENABLE = yes
 KEYLOGGER_ENABLE ?= yes
 UCIS_ENABLE = yes
 MOUSEKEY_ENABLE = no
+LEADER_ENABLE = yes
 
 AUTOLOG_ENABLE ?= no
 
diff --git a/layouts/community/ergodox/alphadox/config.h b/layouts/community/ergodox/alphadox/config.h
index 6fc64f5082..9e076dead1 100644
--- a/layouts/community/ergodox/alphadox/config.h
+++ b/layouts/community/ergodox/alphadox/config.h
@@ -4,7 +4,6 @@
 #include QMK_KEYBOARD_CONFIG_H
 
 #define FORCE_NKRO
-#define PREVENT_STUCK_MODIFIERS
 
 #undef TAPPING_TERM
 #undef IGNORE_MOD_TAP_INTERRUPT
diff --git a/layouts/community/ergodox/deadcyclo/rules.mk b/layouts/community/ergodox/deadcyclo/rules.mk
index 039f07c8e3..f5093529bf 100644
--- a/layouts/community/ergodox/deadcyclo/rules.mk
+++ b/layouts/community/ergodox/deadcyclo/rules.mk
@@ -1 +1,2 @@
 UNICODE_ENABLE = yes
+LEADER_ENABLE = yes
diff --git a/layouts/community/ergodox/erez_experimental/rules.mk b/layouts/community/ergodox/erez_experimental/rules.mk
index 839dd82e1e..f68b56f872 100644
--- a/layouts/community/ergodox/erez_experimental/rules.mk
+++ b/layouts/community/ergodox/erez_experimental/rules.mk
@@ -3,5 +3,4 @@
 
 SLEEP_LED_ENABLE = no  # Breathing sleep LED during USB suspend
 COMMAND_ENABLE   = no  # Commands for debug and configuration
-
-
+LEADER_ENABLE = yes
diff --git a/layouts/community/ergodox/familiar/rules.mk b/layouts/community/ergodox/familiar/rules.mk
index 31e0fcf293..4a3c58621c 100644
--- a/layouts/community/ergodox/familiar/rules.mk
+++ b/layouts/community/ergodox/familiar/rules.mk
@@ -1 +1,2 @@
 TAP_DANCE_ENABLE=yes
+LEADER_ENABLE = yes
diff --git a/layouts/community/ergodox/mclennon_osx/README.md b/layouts/community/ergodox/mclennon_osx/README.md
index 28cdb7c108..53b3d48414 100644
--- a/layouts/community/ergodox/mclennon_osx/README.md
+++ b/layouts/community/ergodox/mclennon_osx/README.md
@@ -1,5 +1,5 @@
 # Ergodox EZ for OS X
 
-This keymapping is designed to be reasonably familiar to an ordinary Mac keyboard while taking advantage of the Ergodox EZ's features. Caps lock instead enables a layer which allows a user to use HJKL as arrow keys and to control media. Shift and control have additional mappings on S and D to provide easier access while holding down caps lock. 
+This keymapping is designed to be reasonably familiar to an ordinary Mac keyboard while taking advantage of the Ergodox EZ's features. Caps lock instead enables a layer which allows a user to use HJKL as arrow keys and to control media. Shift and control have additional mappings on S and D to provide easier access while holding down caps lock.
 
-If you choose to compile this yourself, be sure to compile with `#define PREVENT_STUCK_MODIFIERS` in your `config.h`. Firmware built using [qmk_firmware](https://github.com/qmk/qmk_firmware/).
+Firmware built using [qmk_firmware](https://github.com/qmk/qmk_firmware/).
diff --git a/layouts/community/ergodox/techtomas/readme.md b/layouts/community/ergodox/techtomas/readme.md
index 36e0591a8e..3d1bcb9e11 100644
--- a/layouts/community/ergodox/techtomas/readme.md
+++ b/layouts/community/ergodox/techtomas/readme.md
@@ -39,7 +39,7 @@ The right arrow key and End key toggle the control layer on the left board. Ther
 On the left board you have mouse control with left & right click in the location of the G and B keys.
 On the right board you have vim-style arrow keys using hjkl
 
-The left thumb cluster moves shift and alt within easy reach while holding the toggle (end). So far I've found this convient to navigate and  skip around text when using the hjkl arrow keys. I found that it was easy to get the alt key stuck on depending on what key you released first so I added the PREVENT_STUCK_MODIFIERS to the config.h to help with that.
+The left thumb cluster moves shift and alt within easy reach while holding the toggle (end). So far I've found this convient to navigate and  skip around text when using the hjkl arrow keys.
 
 ## Changelog
 
diff --git a/layouts/community/ortho_4x12/symbolic/config.h b/layouts/community/ortho_4x12/symbolic/config.h
index 702c9226c6..c29b077062 100644
--- a/layouts/community/ortho_4x12/symbolic/config.h
+++ b/layouts/community/ortho_4x12/symbolic/config.h
@@ -20,10 +20,6 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #pragma once
 
-// prevent stuck modifiers
-#define PREVENT_STUCK_MODIFIERS
-
-
 // hold & tapping delay setting
 #define TAPPING_TERM 100
 
diff --git a/layouts/community/tkl_ansi/talljoe-tkl/config.h b/layouts/community/tkl_ansi/talljoe-tkl/config.h
index 8b27d41365..02f8a94e39 100644
--- a/layouts/community/tkl_ansi/talljoe-tkl/config.h
+++ b/layouts/community/tkl_ansi/talljoe-tkl/config.h
@@ -3,7 +3,6 @@
 
 #include QMK_KEYBOARD_CONFIG_H
 
-#define PREVENT_STUCK_MODIFIERS
 #define ENABLE_GAME_LAYER
 
 #define TEMPLATE_TKL(\