Added new criteria 'tiling' / 'floating'. (#2481)

These criteria allow selecting only windows in a specific mode, i.e.,
tiling and floating, respectively.

fixes #2406

src/match.c

@@ -28,6 +28,7 @@
 void match_init(Match *match) {
     memset(match, 0, sizeof(Match));
     match->urgent = U_DONTCHECK;
+    match->window_mode = WM_ANY;
     /* we use this as the placeholder value for "not set". */
     match->window_type = UINT32_MAX;
 }
@@ -53,7 +54,7 @@ bool match_is_empty(Match *match) {
             match->window_type == UINT32_MAX &&
             match->con_id == NULL &&
             match->dock == M_NODOCK &&
-            match->floating == M_ANY);
+            match->window_mode == WM_ANY);
 }
 
 /*
@@ -243,6 +244,21 @@ bool match_matches_window(Match *match, i3Window *window) {
         }
     }
 
+    if (match->window_mode != WM_ANY) {
+        if ((con = con_by_window_id(window->id)) == NULL)
+            return false;
+
+        const bool floating = (con_inside_floating(con) != NULL);
+
+        if ((match->window_mode == WM_TILING && floating) ||
+            (match->window_mode == WM_FLOATING && !floating)) {
+            LOG("window_mode does not match\n");
+            return false;
+        }
+
+        LOG("window_mode matches\n");
+    }
+
     return true;
 }
 
@@ -384,5 +400,15 @@ void match_parse_property(Match *match, const char *ctype, const char *cvalue) {
         return;
     }
 
+    if (strcmp(ctype, "tiling") == 0) {
+        match->window_mode = WM_TILING;
+        return;
+    }
+
+    if (strcmp(ctype, "floating") == 0) {
+        match->window_mode = WM_FLOATING;
+        return;
+    }
+
     ELOG("Unknown criterion: %s\n", ctype);
 }