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If it's a file buffer (won't work for scratch buffers etc.), you can:

1. :let @f=@%ENTER — in the source window;
   • This replaces contents of regular register f with contents of special register %, which contains current file name.
   • Note: I chose register f as in file, but you can use any other register you like.
   • You can verify that the register contains correct path with: :echo @f
2. Optionally: Ctrl-WCtrl-Q — to close the old window;
3. gt / gT — navigate to the target tab (and window);
4. Ctrl-Ws — split the tab any way you like, to open a new window;
5. :e␣Ctrl-RfENTER
   • in the newly opened window, loads a file from the path stored in register f;
   • Note: the ␣ character here marks a regular space.

Important note: the final step won't work correctly if the path contains spaces! :-(

_{Inspired by answers from lkraav and ingo-karkat.}

If it's a file buffer (won't work for scratch buffers etc.), you can:

1. :let @f=@%ENTER — in the source window;
   • This replaces contents of regular register f with contents of special register %, which contains current file name.
   • Note: I chose register f as in file, but you can use any other register you like.
   • You can verify that the register contains correct path with: :echo @f
2. Optionally: Ctrl-WCtrl-Q — to close the old window;
3. gt / gT — navigate to the target tab (and window);
4. Ctrl-Ws — split the tab any way you like, to open a new window;
5. :e␣Ctrl-RfENTER
   • in the newly opened window, loads a file from the path stored in register f;
   • Note: the ␣ character here marks a regular space.

Important note: the final step won't work correctly if the path contains spaces or some special characters! :-( As a workaround, the following, slightly longer command should work for paths with spaces (though it may still fail for some other special characters):

• :e␣"Ctrl-Rf"ENTER

(that is, quoting the result of Ctrl-R, f )

_{Inspired by answers from lkraav and ingo-karkat.}

If it's a file buffer (won't work for scratch buffers etc.), you can:

1. :let @f=@%ENTER — in the source window;
   • This replaces contents of regular register f with contents of special register %, which contains current file name.
   • Note: I chose register f as in file, but you can use any other register you like.
   • You can verify that the register contains correct path with: :echo @f
2. Optionally: Ctrl-WCtrl-Q — to close the old window;
3. gt / gT — navigate to the target tab (and window);
4. Ctrl-Ws — split the tab any way you like, to open a new window;
5. :e␣Ctrl-RfENTER
   • in the newly opened window, loads a file from the path stored in register f;
   • Note: the ␣ character here marks a regular space.

_{Inspired by answers from lkraav and ingo-karkat.}

If it's a file buffer (won't work for scratch buffers etc.), you can:

1. :let @f=@%ENTER — in the source window;
   • This replaces contents of regular register f with contents of special register %, which contains current file name.
   • Note: I chose register f as in file, but you can use any other register you like.
   • You can verify that the register contains correct path with: :echo @f
2. Optionally: Ctrl-WCtrl-Q — to close the old window;
3. gt / gT — navigate to the target tab (and window);
4. Ctrl-Ws — split the tab any way you like, to open a new window;
5. :e␣Ctrl-RfENTER
   • in the newly opened window, loads a file from the path stored in register f;
   • Note: the ␣ character here marks a regular space.

Important note: the final step won't work correctly if the path contains spaces! :-(

_{Inspired by answers from lkraav and ingo-karkat.}

If it's a file buffer (won't work for scratch buffers etc.), you can:

1. :let @f=@%ENTER — in the source window;
   • This replaces contents of regular register f with contents of special register %, which contains current file name.
   • Note: I chose register f as in file, but you can use any other register you like.
   • You can verify that the register contains correct path with: :echo @f
2. Optionally: Ctrl-WCtrl-Q — to close the old window;
3. gt / gT — navigate to the target tab (and window);
4. Ctrl-Ws — split the tab any way you like, to open a new window;
5. :e␣Ctrl-RfENTER
   • in the newly opened window, loads a file from the path stored in register f;
   • Note: the ␣ character here marks a regular space.

_{Inspired by answers from lkraav and ingo-karkat.}

If it's a file buffer (won't work for scratch buffers etc.), you can:

1. :let @f=@%ENTER — in the source window;
   • This replaces contents of regular register f with contents of special register %, which contains current file name.
   • Note: I chose register f as in file, but you can use any other register you like.
   • You can verify that the register contains correct path with: :echo @f
2. Optionally: Ctrl-WCtrl-Q — to close the old window;
3. gt / gT — navigate to the target tab (and window);
4. Ctrl-Ws — split the tab any way you like, to open a new window;
5. :e␣Ctrl-RfENTER
   • in the newly opened window, loads a file from the path stored in register f;
   • Note: the ␣ character here marks a regular space.

_{Inspired by answers from lkraav and ingo-karkat.}