Fix the same frames being exported multiple times when "Selected fra…

…mes" is selected, and multiple cels of the same frames are currently selected on the timeline - Fixes #1001

CHANGELOG.md

@@ -30,6 +30,7 @@ Built using Godot 3.5.2
 - Optimize canvas drawing by only updating it when the image(s) have changed. [ac6a4db43d9296ebc03e639d8199dd3878a25d86](https://github.com/Orama-Interactive/Pixelorama/commit/ac6a4db43d9296ebc03e639d8199dd3878a25d86)
 - Fix bug where using shortcuts to switch between frames also moved the selection, causing deletions.
 - Pxo files can now be loaded from the Open menu option in the Web version. [3dcc51705a999145e53a8e6d4de217dc03b0f147](https://github.com/Orama-Interactive/Pixelorama/commit/3dcc51705a999145e53a8e6d4de217dc03b0f147)
+- The same frames are no longer being exported multiple times when "Selected frames" is selected, and multiple cels of the same frames are currently selected on the timeline. [#1001](https://github.com/Orama-Interactive/Pixelorama/issues/1001)
 - Fixed crash due to division by zero when locking two or three ValueSliders, and one of them has the value of 0 and the user attempts to change it.
 - Fixed exporting selected layers not including the non-selected frames.
 - Made the color picker not select fully transparent pixels that are not black. [#999](https://github.com/Orama-Interactive/Pixelorama/issues/999)

src/Autoload/Export.gd

@@ -147,7 +147,9 @@ func calculate_frames(project := Global.current_project) -> Array:
 		frames = project.frames.slice(frame_start - 1, frame_end - 1, 1, true)
 	elif frame_current_tag == 1:  # Selected frames
 		for cel in project.selected_cels:
-			frames.append(project.frames[cel[0]])
+			var frame: Frame = project.frames[cel[0]]
+			if not frames.has(frame):
+				frames.append(frame)
 	else:  # All frames
 		frames = project.frames.duplicate()