Correctly handle bindings for the same mod key with and without --release

Before this commit, get_binding() exited on the first match without
marking the rest --release bindings with B_UPON_KEYRELEASE_IGNORE_MODS.

Similarly, once it found a --release binding during a KeyPress event it
would stop searching for a matching key press binding.

Example config, placing the --release line first will trigger the second
problem:

# i3 config file (v4)
bindsym Super_L exec notify-send "press"
# or
# bindcode 133 exec notify-send "press"
bindsym --release Super_L exec notify-send "release"
# or
# bindcode --release 133 exec notify-send "release"

Fixes #2733

src/bindings.c

@@ -198,6 +198,7 @@ void regrab_all_buttons(xcb_connection_t *conn) {
  */
 static Binding *get_binding(i3_event_state_mask_t state_filtered, bool is_release, uint16_t input_code, input_type_t input_type) {
     Binding *bind;
+    Binding *result = NULL;
 
     if (!is_release) {
         /* On a press event, we first reset all B_UPON_KEYRELEASE_IGNORE_MODS
@@ -271,23 +272,26 @@ static Binding *get_binding(i3_event_state_mask_t state_filtered, bool is_releas
         if (bind->release == B_UPON_KEYRELEASE && !is_release) {
             bind->release = B_UPON_KEYRELEASE_IGNORE_MODS;
             DLOG("marked bind %p as B_UPON_KEYRELEASE_IGNORE_MODS\n", bind);
-            /* The correct binding has been found, so abort the search, but
+            if (result) {
-             * also don’t return this binding, since it should not be executed
-             * yet (only when the keys are released). */
-            bind = TAILQ_END(bindings);
                 break;
             }
-
-        /* Check if the binding is for a press or a release event */
-        if ((bind->release == B_UPON_KEYPRESS && is_release) ||
-            (bind->release >= B_UPON_KEYRELEASE && !is_release)) {
             continue;
         }
 
-        break;
+        /* Check if the binding is for a press or a release event */
+        if ((bind->release == B_UPON_KEYPRESS && is_release)) {
+            continue;
         }
 
-    return (bind == TAILQ_END(bindings) ? NULL : bind);
+        if (is_release) {
+            return bind;
+        } else if (!result) {
+            /* Continue looping to mark needed B_UPON_KEYRELEASE_IGNORE_MODS. */
+            result = bind;
+        }
+    }
+
+    return result;
 }
 
 /*

testcases/t/258-keypress-release.t

@@ -31,6 +31,11 @@ bindsym Mod1+b nop Mod1+b
 bindsym --release Mod1+Shift+b nop Mod1+Shift+b release
 
 bindsym --release Shift+x nop Shift+x
+
+# see issue #2733
+# 133 == Mod4
+bindcode 133 nop 133
+bindcode --release 133 nop 133 release
 EOT
 use i3test::XTEST;
 use ExtUtils::PkgConfig;
@@ -110,6 +115,25 @@ is(listen_for_binding(
         ),
        'Shift+x',
        'triggered the "Shift+x" keybinding by releasing Shift first');
+
+is(listen_for_binding(
+    sub {
+        xtest_key_press(133);
+        xtest_sync_with_i3;
+    },
+    ),
+    '133',
+    'triggered the 133 keycode press binding');
+
+is(listen_for_binding(
+    sub {
+        xtest_key_release(133);
+        xtest_sync_with_i3;
+    },
+    ),
+    '133 release',
+    'triggered the 133 keycode release binding');
+
 }
 
 done_testing;