Add option for StringMobject to only render a single svg

Then set as the default behavior for MTex and Text

manimlib/mobject/svg/mtex_mobject.py

@@ -29,6 +29,7 @@ class MTex(StringMobject):
         additional_preamble: str = "",
         tex_to_color_map: dict = dict(),
         t2c: dict = dict(),
+        use_labelled_svg: bool = True,
         **kwargs
     ):
         # Prevent from passing an empty string.
@@ -40,7 +41,7 @@ class MTex(StringMobject):
         self.additional_preamble = additional_preamble
         self.tex_to_color_map = dict(**t2c, **tex_to_color_map)
 
-        super().__init__(tex_string, **kwargs)
+        super().__init__(tex_string, use_labelled_svg=use_labelled_svg, **kwargs)
 
         self.set_color_by_tex_to_color_map(self.tex_to_color_map)
         self.scale(SCALE_FACTOR_PER_FONT_POINT * font_size)

manimlib/mobject/svg/svg_mobject.py

@@ -27,7 +27,7 @@ if TYPE_CHECKING:
 
 
 
-SVG_HASH_TO_MOB_MAP: dict[int, VMobject] = {}
+SVG_HASH_TO_MOB_MAP: dict[int, list[VMobject]] = {}
 
 
 def _convert_point_to_3d(x: float, y: float) -> np.ndarray:
@@ -97,12 +97,13 @@ class SVGMobject(VMobject):
     def init_svg_mobject(self) -> None:
         hash_val = hash_obj(self.hash_seed)
         if hash_val in SVG_HASH_TO_MOB_MAP:
-            mob = SVG_HASH_TO_MOB_MAP[hash_val].copy()
-            self.add(*mob)
-            return
+            submobs = [sm.copy() for sm in SVG_HASH_TO_MOB_MAP[hash_val]]
+        else:
+            submobs = self.mobjects_from_file(self.get_file_path())
+            SVG_HASH_TO_MOB_MAP[hash_val] = [sm.copy() for sm in submobs]
 
-        self.generate_mobject()
-        SVG_HASH_TO_MOB_MAP[hash_val] = self.copy()
+        self.add(*submobs)
+        self.flip(RIGHT)  # Flip y
 
     @property
     def hash_seed(self) -> tuple:
@@ -115,8 +116,7 @@ class SVGMobject(VMobject):
             self.file_name
         )
 
-    def generate_mobject(self) -> None:
-        file_path = self.get_file_path()
+    def mobjects_from_file(self, file_path: str) -> list[VMobject]:
         element_tree = ET.parse(file_path)
         new_tree = self.modify_xml_tree(element_tree)
 
@@ -127,9 +127,7 @@ class SVGMobject(VMobject):
         svg = se.SVG.parse(data_stream)
         data_stream.close()
 
-        mobjects = self.get_mobjects_from(svg)
-        self.add(*mobjects)
-        self.flip(RIGHT)  # Flip y
+        return self.mobjects_from_svg(svg)
 
     def get_file_path(self) -> str:
         if self.file_name is None:
@@ -178,7 +176,7 @@ class SVGMobject(VMobject):
                 result[svg_key] = str(svg_default_dict[style_key])
         return result
 
-    def get_mobjects_from(self, svg: se.SVG) -> list[VMobject]:
+    def mobjects_from_svg(self, svg: se.SVG) -> list[VMobject]:
         result = []
         for shape in svg.elements():
             if isinstance(shape, (se.Group, se.Use)):

manimlib/mobject/svg/text_mobject.py

@@ -416,9 +416,10 @@ class Text(MarkupText):
         text: str,
         # For backward compatibility
         isolate: Selector = (re.compile(r"\w+", re.U), re.compile(r"\S+", re.U)),
+        use_labelled_svg: bool = True,
         **kwargs
     ):
-        super().__init__(text, isolate=isolate, **kwargs)
+        super().__init__(text, isolate=isolate, use_labelled_svg=use_labelled_svg, **kwargs)
 
     @staticmethod
     def get_command_matches(string: str) -> list[re.Match]: