Refact/multi window soft rendering (#8343)

* refact: multi_window_soft_rendering

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix: window pos, potential wait for image

Signed-off-by: fufesou <linlong1266@gmail.com>

* comments

Signed-off-by: fufesou <linlong1266@gmail.com>

* remove debug print

Signed-off-by: fufesou <linlong1266@gmail.com>

* explicitly set rgba_data.size_got to false after init

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact: multi window, merge images, render with texture

Signed-off-by: fufesou <linlong1266@gmail.com>

* revert, flutter.rs, rgba valid

Signed-off-by: fufesou <linlong1266@gmail.com>

* Add displays index before sending capture msg

Signed-off-by: fufesou <linlong1266@gmail.com>

* refact: multi window, soft rendering

Signed-off-by: fufesou <linlong1266@gmail.com>

* fix: build

Signed-off-by: fufesou <linlong1266@gmail.com>

---------

Signed-off-by: fufesou <linlong1266@gmail.com>

flutter/lib/common/widgets/setting_widgets.dart

@@ -234,12 +234,12 @@ List<(String, String)> otherDefaultSettings() {
     ('True color (4:4:4)', kOptionI444),
     ('Reverse mouse wheel', kKeyReverseMouseWheel),
     ('swap-left-right-mouse', kOptionSwapLeftRightMouse),
-    if (isDesktop && bind.mainGetUseTextureRender())
+    if (isDesktop)
       (
         'Show displays as individual windows',
         kKeyShowDisplaysAsIndividualWindows
       ),
-    if (isDesktop && bind.mainGetUseTextureRender())
+    if (isDesktop)
       (
         'Use all my displays for the remote session',
         kKeyUseAllMyDisplaysForTheRemoteSession