List available shortcut keys on error

Fixes #1681 <https://github.com/Genymobile/scrcpy/issues/1681>

Suggested-by: Moritz Schulz <moritzleni@gmail.com>

BUILD.md

@@ -254,10 +254,10 @@ You can then [run](README.md#run) _scrcpy_.
 
 ## Prebuilt server
 
- - [`scrcpy-server-v1.15.1`][direct-scrcpy-server]  
-   _(SHA-256: fe06bd6a30da8c89860bf5e16eecce2b5054d4644c84289670ce00ca5d1637c3)_
+ - [`scrcpy-server-v1.16`][direct-scrcpy-server]  
+   _(SHA-256: 94a79e05b4498d0460ab7bd9d12cbf05156e3a47bf0c5d1420cee1d4493b3832)_
 
-[direct-scrcpy-server]: https://github.com/Genymobile/scrcpy/releases/download/v1.15.1/scrcpy-server-v1.15.1
+[direct-scrcpy-server]: https://github.com/Genymobile/scrcpy/releases/download/v1.16/scrcpy-server-v1.16
 
 Download the prebuilt server somewhere, and specify its path during the Meson
 configuration:

README.md

@@ -1,4 +1,4 @@
-# scrcpy (v1.15.1)
+# scrcpy (v1.16)
 
 [Read in another language](#translations)
 
@@ -77,10 +77,10 @@ hard).
 For Windows, for simplicity, a prebuilt archive with all the dependencies
 (including `adb`) is available:
 
- - [`scrcpy-win64-v1.15.1.zip`][direct-win64]  
-   _(SHA-256: 78fba4caad6328016ea93219254b5df391f24224c519a2c8e3f070695b8b38ff)_
+ - [`scrcpy-win64-v1.16.zip`][direct-win64]  
+   _(SHA-256: 3f30dc5db1a2f95c2b40a0f5de91ec1642d9f53799250a8c529bc882bc0918f0)_
 
-[direct-win64]: https://github.com/Genymobile/scrcpy/releases/download/v1.15.1/scrcpy-win64-v1.15.1.zip
+[direct-win64]: https://github.com/Genymobile/scrcpy/releases/download/v1.16/scrcpy-win64-v1.16.zip
 
 It is also available in [Chocolatey]:
 

app/scrcpy.1

@@ -222,7 +222,7 @@ Default is 0 (automatic).\n
 .SH SHORTCUTS
 
 In the following list, MOD is the shortcut modifier. By default, it's (left)
-Alt or (left) Super, but it can be configured by \-\-shortcut-mod.
+Alt or (left) Super, but it can be configured by \-\-shortcut-mod (see above).
 
 .TP
 .B MOD+f

app/src/cli.c

@@ -203,7 +203,7 @@ scrcpy_print_usage(const char *arg0) {
         "\n"
         "    In the following list, MOD is the shortcut modifier. By default,\n"
         "    it's (left) Alt or (left) Super, but it can be configured by\n"
-        "    --shortcut-mod.\n"
+        "    --shortcut-mod (see above).\n"
         "\n"
         "    MOD+f\n"
         "        Switch fullscreen mode\n"
@@ -532,7 +532,9 @@ parse_shortcut_mods_item(const char *item, size_t len) {
         } else if (STREQ("rsuper", item, key_len)) {
             mod |= SC_MOD_RSUPER;
         } else {
-            LOGW("Unknown modifier key: %.*s", (int) key_len, item);
+            LOGE("Unknown modifier key: %.*s "
+                 "(must be one of: lctrl, rctrl, lalt, ralt, lsuper, rsuper)",
+                 (int) key_len, item);
             return 0;
         }
 #undef STREQ