There is a similar plugin to heal-selection, heal-transparency which might work in some circumstances but for your example, not really.
The quickest way is a straight selection -> copy -> paste. Move the floating selection over (shift + keyboard left arrow moves quickly) Repeat the ctl-v, shift + arrow key, to fill the empty area. The whole thing takes a couple of seconds.
A content aware type plugin. One of the gmic filters http://www.gmic.eu in the Repair section. This uses a painted in mask. Default is red, had to change to green for your example & constrained with a selection. https://i.imgur.com/u7HLOOg.jpg Applying settings as shown: https://i.imgur.com/HaOVwwx.jpg Gives a result like this: https://i.imgur.com/arrX9Ia.jpg
Of course depends how keen you are, Basic Gimp, extending the gradient, becomes a judgement call on end colour: https://i.imgur.com/0wUg60X.jpg
Edit: Ah..linux gmic_gimp for linux compilations are IMHO a bit flaky at the moment (the one I used is compiled for my old homespun appimage. If using a flatpack then not going to work. Regular installations then there are two zips here: https://gmic.eu/files/linux/ one for debian sid and one for 'buntu cosmic (Why no other versions I do not know)
The quickest way is a straight selection -> copy -> paste. Move the floating selection over (shift + keyboard left arrow moves quickly) Repeat the ctl-v, shift + arrow key, to fill the empty area. The whole thing takes a couple of seconds.
A content aware type plugin. One of the gmic filters http://www.gmic.eu in the Repair section. This uses a painted in mask. Default is red, had to change to green for your example & constrained with a selection. https://i.imgur.com/u7HLOOg.jpg Applying settings as shown: https://i.imgur.com/HaOVwwx.jpg Gives a result like this: https://i.imgur.com/arrX9Ia.jpg
Of course depends how keen you are, Basic Gimp, extending the gradient, becomes a judgement call on end colour: https://i.imgur.com/0wUg60X.jpg
Edit: Ah..linux gmic_gimp for linux compilations are IMHO a bit flaky at the moment (the one I used is compiled for my old homespun appimage. If using a flatpack then not going to work. Regular installations then there are two zips here: https://gmic.eu/files/linux/ one for debian sid and one for 'buntu cosmic (Why no other versions I do not know)