src/: cope with MuPDF master change to fz_stext_char.

Member is renamed, and srgb values now have non-zero s.

src/__init__.py

@@ -16548,7 +16548,10 @@ def __str__(self):
         style.size = ch.m_internal.size
         style.flags = flags
         style.font = JM_font_name(mupdf.FzFont(mupdf.ll_fz_keep_font(ch.m_internal.font)))
-        style.color = ch.m_internal.color
+        if mupdf_version_tuple >= (1, 26):
+            style.color = ch.m_internal.argb
+        else:
+            style.color = ch.m_internal.color
         style.asc = JM_font_ascender(mupdf.FzFont(mupdf.ll_fz_keep_font(ch.m_internal.font)))
         style.desc = JM_font_descender(mupdf.FzFont(mupdf.ll_fz_keep_font(ch.m_internal.font)))
 
@@ -21058,10 +21061,12 @@ def sRGB_to_rgb(srgb: int) -> tuple:
     There is **no error checking** for performance reasons!
 
     Args:
-        srgb: (int) RRGGBB (red, green, blue), each color in range(255).
+        srgb: (int) SSRRGGBB (red, green, blue), each color in range(255).
+        With MuPDF < 1.26, `s` is always 0.
     Returns:
         Tuple (red, green, blue) each item in interval 0 <= item <= 255.
     """
+    srgb &= 0xffffff
     r = srgb >> 16
     g = (srgb - (r << 16)) >> 8
     b = srgb - (r << 16) - (g << 8)

src/extra.i

@@ -3045,7 +3045,7 @@ mupdf::FzRect JM_make_spanlist(
         float size = -1;
         int flags = -1;
         const char *font = "";
-        int color = -1;
+        unsigned int color = -1;
         float asc = 0;
         float desc = 0;
     };
@@ -3064,7 +3064,11 @@ mupdf::FzRect JM_make_spanlist(
         style.size = ch.m_internal->size;
         style.flags = flags;
         style.font = JM_font_name(ch.m_internal->font);
-        style.color = ch.m_internal->color;
+        #if (FZ_VERSION_MAJOR > 1 || (FZ_VERSION_MAJOR == 1 && FZ_VERSION_MINOR >= 26))
+            style.color = ch.m_internal->argb;
+        #else
+            style.color = ch.m_internal->color;
+        #endif
         style.asc = JM_font_ascender(ch.m_internal->font);
         style.desc = JM_font_descender(ch.m_internal->font);