Use find_exe() for resolving editor as well

Avoids having to exec the shell in most cases

kittens/tui/images.py

@@ -14,11 +14,10 @@ from typing import (
     Union
 )
 
-from kitty.constants import is_macos
 from kitty.typing import (
     CompletedProcess, GRT_a, GRT_d, GRT_f, GRT_m, GRT_o, GRT_t, HandlerType
 )
-from kitty.utils import ScreenSize, fit_image
+from kitty.utils import ScreenSize, find_exe, fit_image
 
 from .operations import cursor
 
@@ -76,21 +75,6 @@ def identify(path: str) -> ImageData:
     return ImageData(parts[0].lower(), int(parts[1]), int(parts[2]), mode)
 
 
-def find_exe(name: str) -> Optional[str]:
-    import shutil
-    ans = shutil.which(name)
-    if ans is None:
-        # In case PATH is messed up
-        if is_macos:
-            from kitty.utils import system_paths_on_macos
-            paths = system_paths_on_macos()
-        else:
-            paths = ['/usr/local/bin', '/opt/bin', '/usr/bin', '/bin', '/usr/sbin', '/sbin']
-        path = os.pathsep.join(paths) + os.pathsep + os.defpath
-        ans = shutil.which(name, path=path)
-    return ans
-
-
 def convert(
     path: str, m: ImageData,
     available_width: int, available_height: int,