Improve standard reset transform

The built-in reset transform will now reset all transform properties
rather than only a small subset. This makes it more predictable (no more
guessing which properties it will reset) and also future proof as it no
longer requires being kept up to date as an explicit definition.

renpy/common/00definitions.rpy

@@ -27,8 +27,7 @@
 init -1400:
 
     transform reset:
-        alpha 1.0 rotate None zoom 1.0 xzoom 1.0 yzoom 1.0 align (0, 0) alignaround (0, 0) subpixel False
-        xsize None ysize None fit None crop None
+        _reset True
 
     # These are positions that can be used inside at clauses. We set
     # them up here so that they can be used throughout the program.

renpy/display/transform.py

@@ -34,6 +34,7 @@ from renpy.display.accelerator import RenderTransform
 from renpy.atl import position, DualAngle, position_or_none, any_object, bool_or_none, float_or_none, matrix, mesh
 from renpy.display.core import absolute
 
+
 class Camera(renpy.object.Object):
     """
     :doc: point_to_camera
@@ -220,8 +221,6 @@ class TransformState(renpy.object.Object):
             self.xanchor = old_xanchor
             self.yanchor = old_yanchor
 
-
-
     def get_placement(self, cxoffset=0, cyoffset=0):
 
         if self.perspective is not None: # type: ignore
@@ -605,6 +604,18 @@ class TransformState(renpy.object.Object):
 
     xycenter = property(get_pos, set_xycenter)
 
+    def get_reset(self):
+        return False
+
+    def set_reset(self, value):
+        if value:
+            self.take_state(RESET_STATE)
+
+    _reset = property(get_reset, set_reset)
+
+
+RESET_STATE = TransformState()
+
 
 def simplify_position(v):
     if isinstance(v, tuple):
@@ -700,11 +711,15 @@ class Transform(Container):
                  focus=None,
                  default=False,
                  _args=None,
-
+                 *,
+                 reset=False,
                  **kwargs):
 
         properties = {k: kwargs.pop(k) for k in style_properties if k in kwargs}
 
+        if reset:
+            kwargs = {"_reset": True} | kwargs
+
         self.kwargs = kwargs
         self.style_arg = style
 
@@ -1402,6 +1417,8 @@ ALIASES = {
     "xysize" : (position_or_none, position_or_none),
     "yalign" : position_or_none, # documented as float
     "ycenter" : position_or_none,
+
+    "_reset" : bool,
 }
 
 renpy.atl.PROPERTIES.update(ALIASES)