Add option to force legacy method for pasting

Some devices do not behave as expected when setting the device clipboard
programmatically.

Add an option --legacy-paste to change the behavior of Ctrl+v and MOD+v
so that they inject the computer clipboard text as a sequence of key
events (the same way as MOD+Shift+v).

Fixes #1750 <https://github.com/Genymobile/scrcpy/issues/1750>
Fixes #1771 <https://github.com/Genymobile/scrcpy/issues/1771>

README.md

@@ -548,6 +548,10 @@ into the device clipboard. As a consequence, any Android application could read
 its content. You should avoid to paste sensitive content (like passwords) that
 way.
 
+Some devices do not behave as expected when setting the device clipboard
+programmatically. An option `--legacy-paste` is provided to change the behavior
+of <kbd>Ctrl</kbd>+<kbd>v</kbd> and <kbd>MOD</kbd>+<kbd>v</kbd> to also inject
+the computer clipboard text as a sequence of key events.
 
 #### Pinch-to-zoom
 

app/scrcpy.1

@@ -68,6 +68,12 @@ Start in fullscreen.
 .B \-h, \-\-help
 Print this help.
 
+.TP
+.B \-\-legacy\-paste
+Inject computer clipboard text as a sequence of key events on Ctrl+v (like MOD+Shift+v).
+
+This is a workaround for some devices not behaving as expected when setting the device clipboard programmatically.
+
 .TP
 .BI "\-\-lock\-video\-orientation " value
 Lock video orientation to \fIvalue\fR. Possible values are -1 (unlocked), 0, 1, 2 and 3. Natural device orientation is 0, and each increment adds a 90 degrees otation counterclockwise.

app/src/cli.c

@@ -63,6 +63,12 @@ scrcpy_print_usage(const char *arg0) {
         "    -h, --help\n"
         "        Print this help.\n"
         "\n"
+        "    --legacy-paste\n"
+        "        Inject computer clipboard text as a sequence of key events\n"
+        "        on Ctrl+v (like MOD+Shift+v).\n"
+        "        This is a workaround for some devices not behaving as\n"
+        "        expected when setting the device clipboard programmatically.\n"
+        "\n"
         "    --lock-video-orientation value\n"
         "        Lock video orientation to value.\n"
         "        Possible values are -1 (unlocked), 0, 1, 2 and 3.\n"
@@ -651,6 +657,7 @@ guess_record_format(const char *filename) {
 #define OPT_DISABLE_SCREENSAVER    1020
 #define OPT_SHORTCUT_MOD           1021
 #define OPT_NO_KEY_REPEAT          1022
+#define OPT_LEGACY_PASTE           1023
 
 bool
 scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
@@ -666,6 +673,7 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
                                                   OPT_FORCE_ADB_FORWARD},
         {"fullscreen",             no_argument,       NULL, 'f'},
         {"help",                   no_argument,       NULL, 'h'},
+        {"legacy-paste",           no_argument,       NULL, OPT_LEGACY_PASTE},
         {"lock-video-orientation", required_argument, NULL,
                                                   OPT_LOCK_VIDEO_ORIENTATION},
         {"max-fps",                required_argument, NULL, OPT_MAX_FPS},
@@ -856,6 +864,9 @@ scrcpy_parse_args(struct scrcpy_cli_args *args, int argc, char *argv[]) {
                     return false;
                 }
                 break;
+            case OPT_LEGACY_PASTE:
+                opts->legacy_paste = true;
+                break;
             default:
                 // getopt prints the error message on stderr
                 return false;

app/src/input_manager.c

@@ -60,6 +60,7 @@ input_manager_init(struct input_manager *im,
     im->control = options->control;
     im->forward_key_repeat = options->forward_key_repeat;
     im->prefer_text = options->prefer_text;
+    im->legacy_paste = options->legacy_paste;
 
     const struct sc_shortcut_mods *shortcut_mods = &options->shortcut_mods;
     assert(shortcut_mods->count);
@@ -440,7 +441,7 @@ input_manager_process_key(struct input_manager *im,
                 return;
             case SDLK_v:
                 if (control && !repeat && down) {
-                    if (shift) {
+                    if (shift || im->legacy_paste) {
                         // inject the text as input events
                         clipboard_paste(controller);
                     } else {
@@ -504,6 +505,11 @@ input_manager_process_key(struct input_manager *im,
     }
 
     if (ctrl && !shift && keycode == SDLK_v && down && !repeat) {
+        if (im->legacy_paste) {
+            // inject the text as input events
+            clipboard_paste(controller);
+            return;
+        }
         // Synchronize the computer clipboard to the device clipboard before
         // sending Ctrl+v, to allow seamless copy-paste.
         set_device_clipboard(controller, false);

app/src/input_manager.h

@@ -25,6 +25,7 @@ struct input_manager {
     bool control;
     bool forward_key_repeat;
     bool prefer_text;
+    bool legacy_paste;
 
     struct {
         unsigned data[SC_MAX_SHORTCUT_MODS];

app/src/scrcpy.h

@@ -79,6 +79,7 @@ struct scrcpy_options {
     bool force_adb_forward;
     bool disable_screensaver;
     bool forward_key_repeat;
+    bool legacy_paste;
 };
 
 #define SCRCPY_OPTIONS_DEFAULT { \
@@ -123,6 +124,7 @@ struct scrcpy_options {
     .force_adb_forward = false, \
     .disable_screensaver = false, \
     .forward_key_repeat = true, \
+    .legacy_paste = false, \
 }
 
 bool